All Wiring Diagrams for GMC Forward Control P1994 3500 model

COMPUTER DATA LINES

4.3L

4.3L (VIN Z), Data Link Connector Wiring Diagram, Commercial Chassis with A/T for GMC Forward Control P1994 3500

List of elements for 4.3L (VIN Z), Data Link Connector Wiring Diagram, Commercial Chassis with A/T for GMC Forward Control P1994 3500:

• (4.3l)
• (5.7l & 7.4l)
• (behind left side of shipping panel)
• (front of engine)
• A14 diagnostic test c250
• C201
• Data link connector
• F9 serial data c251
• G125
• Powertrain control module (behind left side of shipping panel)

4.3L (VIN Z), Data Link Connector Wiring Diagram, Commercial Chassis with M/T for GMC Forward Control P1994 3500

List of elements for 4.3L (VIN Z), Data Link Connector Wiring Diagram, Commercial Chassis with M/T for GMC Forward Control P1994 3500:

• (behind left side of shipping panel)
• (front of engine)
• A8 serial data
• A9 diagnostic test c251
• C201
• Data link connector
• G125
• Powertrain control module (behind left side of shipping panel)

4.3L (VIN Z), Data Link Connector Wiring Diagram, Cutaway for GMC Forward Control P1994 3500

List of elements for 4.3L (VIN Z), Data Link Connector Wiring Diagram, Cutaway for GMC Forward Control P1994 3500:

• (behind left side of i/p, below steering column)
• (top right front of engine)
• A14 diagnostic test c303
• C224
• Data link connector
• F9 serial data c304
• G119
• Powertrain control module (mounted under driver's seat)

5.7L

5.7L (VIN K), Data Link Connector Wiring Diagram, Commercial Chassis with A/T for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Data Link Connector Wiring Diagram, Commercial Chassis with A/T for GMC Forward Control P1994 3500:

• (4.3l)
• (5.7l & 7.4l)
• (behind left side of shipping panel)
• (front of engine)
• A14 diagnostic test c250
• C201
• Data link connector
• F9 serial data c251
• G125
• Powertrain control module (behind left side of shipping panel)

5.7L (VIN K), Data Link Connector Wiring Diagram, Commercial Chassis with M/T for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Data Link Connector Wiring Diagram, Commercial Chassis with M/T for GMC Forward Control P1994 3500:

• (behind left side of shipping panel)
• (front of engine)
• A8 serial data
• A9 diagnostic test c251
• C201
• Data link connector
• G125
• Powertrain control module (behind left side of shipping panel)

5.7L (VIN K), Data Link Connector Wiring Diagram, Cutaway for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Data Link Connector Wiring Diagram, Cutaway for GMC Forward Control P1994 3500:

• (behind left side of i/p, below steering column)
• (top right front of engine)
• A14 diagnostic test c303
• C224
• Data link connector
• F9 serial data c304
• G119
• Powertrain control module (mounted under driver's seat)

6.5L

6.5L (VIN F), Data Link Connector Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500

List of elements for 6.5L (VIN F), Data Link Connector Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500:

• (behind left side of shipping panel)
• (top center front of engine)
• A8 diagnostic test c253
• B10 serial data
• C201
• Data link connector
• G125
• Transmission control module (behind left side of shipping panel)

6.5L (VIN Y), Data Link Connector Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500

List of elements for 6.5L (VIN Y), Data Link Connector Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500:

• (behind left side of shipping panel)
• (top center front of engine)
• A8 diagnostic test c253
• B10 serial data
• C201
• Data link connector
• G125
• Transmission control module (behind left side of shipping panel)

7.4L

7.4L (VIN N), Data Link Connector Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500

List of elements for 7.4L (VIN N), Data Link Connector Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500:

• (4.3l)
• (5.7l & 7.4l)
• (behind left side of shipping panel)
• (front of engine)
• A14 diagnostic test c250
• C201
• Data link connector
• F9 serial data c251
• G125
• Powertrain control module (behind left side of shipping panel)

7.4L (VIN N), Data Link Connector Wiring Diagram, Cutaway for GMC Forward Control P1994 3500

List of elements for 7.4L (VIN N), Data Link Connector Wiring Diagram, Cutaway for GMC Forward Control P1994 3500:

• (behind left side of i/p, below steering column)
• (top right front of engine)
• A14 diagnostic test c303
• C224
• Data link connector
• F9 serial data c304
• G119
• Powertrain control module (mounted under driver's seat)

7.4L (VIN N), Data Link Connector Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500

List of elements for 7.4L (VIN N), Data Link Connector Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500:

• (inside center of shipping panel)
• (top right front of engine)
• A14 diagnostic test c250
• C204
• Data link connector
• F9 serial data c251
• G125
• Powertrain control module (inside left side of shipping panel)

CRUISE CONTROL

Cruise Control Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500

List of elements for Cruise Control Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500:

• Brk sw input
• C r/a input
• Cruise control activator
• Cruise control brake switch (on brake pedal support)
• Cruise control module (behind left side of shipping panel)
• Fuse block
• G202 (at bus bar ground)
• Gages fuse 20a
• Ground
• Hot in run or start
• Ign
• Nca
• On/ off
• On/off input
• R/a
• S/c
• S/c input
• Vehicle speed sensor buffer (left side of shipping panel)
• Vss input

Cruise Control Wiring Diagram, Motor Home Chassis for GMC Forward Control P1994 3500

List of elements for Cruise Control Wiring Diagram, Motor Home Chassis for GMC Forward Control P1994 3500:

• Alt fuse 20a
• Brk sw input
• Cruise control activator
• Cruise control brake switch (on brake pedal support)
• Cruise control module (behind left side of shipping panel)
• Fuse block
• G114 (left rear of engine)
• Ground
• Hot in run or start
• Ign
• On/ off
• On/off input
• R/a
• R/a input
• S/c
• S/c input
• Tan
• Vehicle speed sensor buffer (left side of shipping panel)
• Vss input

ENGINE PERFORMANCE

4.3L

4.3L (VIN Z), Engine Performance Wiring Diagrams, A/T (1 of 3) for GMC Forward Control P1994 3500

List of elements for 4.3L (VIN Z), Engine Performance Wiring Diagrams, A/T (1 of 3) for GMC Forward Control P1994 3500:

• 1-2 shift solenoid control
• 2-3 shift solenoid control
• 4.3l
• 4.3l only
• 5.7l
• 5.7l only
• 7.4l
• 7.4l only
• A/c signal
• A10
• A11
• A12
• A13
• A14
• A15
• A16
• Air condition- ing system
• B10
• B11
• B12
• B13
• B14
• B15
• B16
• Battery feed
• Brake signal
• C308
• C311
• Canister purge control
• Cruise control system
• Cruise signal
• Diagnostic test
• E10
• E11
• E12
• E13
• E14
• E15
• E16
• Ecm bat fuse 10a
• Ecm crnk fuse 10a
• Ect signal
• Egr control
• Egr electonic vacuum regulator soleniod valve (top right front of engine)
• Egr pintle position signal
• Evaporative canister purge control solenoid (top right side of engine)
• Exhaust gas recirculation valve solenoid (top right side of engine)
• F10
• F11
• F12
• F13
• F14
• F15
• F16
• Fuel pump relay ctrl
• Fuel pump signal
• Fuse block
• G125 (front of engine)
• Governor control
• Hot at all times
• Hot in run, bulb test, or start
• Iac "a" high
• Iac "a" low
• Iac "b" high
• Iac "b" low
• Ic bypass
• Ic control
• Ic ref hi
• Ic ref lo
• Idle air control actuator (top rear of engine)
• Idle speed actuator control solenoid (no location available)
• Idle speed actuator ctrl
• Ignition feed
• Inj fuse 7.5a
• Injector 1 control
• Injector 2 control
• Input speed signal high
• Input speed signal low
• Knock sensor input
• Knock signal
• Linear egr vacuum regulator solenoid valve (top front of engine)
• Map signal
• Mil control
• O2s 5.7l & 7.4l h2os 4.3l
• Oxygen sensor ground
• Pcs high
• Pcs low
• Pnk
• Powertrain control module (left side of shipping panel)
• Range signal a
• Range signal b
• Range signal c
• Red
• Sensor ground
• Sensor ref
• Serial data
• System ground
• Tan
• Tcc solenoid control
• Tft signal
• Throttle body fuel injector #1 (top of throttle body unit)
• Throttle body fuel injector #2 (top of throttle body unit)
• Tp reference
• Tp sensor signal
• Transmission input speed sensor (no location)
• Transmission output speed
• Vss signal

4.3L (VIN Z), Engine Performance Wiring Diagrams, A/T Commercial Chassis (2 of 3) for GMC Forward Control P1994 3500

List of elements for 4.3L (VIN Z), Engine Performance Wiring Diagrams, A/T Commercial Chassis (2 of 3) for GMC Forward Control P1994 3500:

• (center rear
• 4.3l and 7.4l
• 5.7l
• Accy
• Alt fuse 20a
• Bulb test
• Distributor
• Engine coolant temperature sensor (top front of engine)
• Fuse block
• G125 (at generator bracket)
• Hot at all times
• Hot in run, bulb test, or start
• Ignition coil (top right rear of engine)
• Ignition switch
• Instrument cluster
• Knock sensor (left rear of engine, near oil pressure sender)
• Knock sensor module (top right side of engine)
• Lock
• Malfunction (service engine soon) indicator
• Manifold absolute pressure sensor (above valve cover)
• Nca
• Of engine)
• Off
• Pnk
• Pnk b
• Pnk/
• Provisions for tachometer
• Red
• Run
• Start
• Tcc/brake switch (on brake pedal support bracket)
• Throttle position sensor (on throttle body)
• Trans fuse 10a

4.3L (VIN Z), Engine Performance Wiring Diagrams, A/T Commercial Chassis (3 of 3) for GMC Forward Control P1994 3500

List of elements for 4.3L (VIN Z), Engine Performance Wiring Diagrams, A/T Commercial Chassis (3 of 3) for GMC Forward Control P1994 3500:

• 1-2 shift soleniod
• 2-3 shift soleniod
• 4.3l
• 5.7l and 7.4l
• Bh conn pin h2
• Data link connector (behind left side of shipping panel)
• Ecm-bat fuse 10a
• Electronic 4-speed automatic overdrive transmission
• Fuel pump and sender (in fuel tank)
• Fuel pump oil pressure switch (top rear of engine)
• Fuel pump prime connector (no location available)
• Fuel pump relay (lower left side of shipping panel)
• Fuse block
• G125 (at generator bracket)
• G125 (front of engine near thermostat)
• G402 (left frame rail near fuel tank)
• Heated oxygen sensor (in exhaust manifold)
• Hot at all times
• Nca
• Oxygen sensor (in exhaust manifold)
• Pnk
• Pressure control solenoid
• Range mode selector
• Red
• Torque converter clutch solenoid
• Trans- mission temp sensor
• Vehicle speed sensor (left rear of transmission)
• Vehicle speed sensor buffer (behind right side of i/p)

4.3L (VIN Z), Engine Performance Wiring Diagrams, M/T Commercial Chassis (1 of 2) for GMC Forward Control P1994 3500

List of elements for 4.3L (VIN Z), Engine Performance Wiring Diagrams, M/T Commercial Chassis (1 of 2) for GMC Forward Control P1994 3500:

• 5 volt ref
• A/c signal
• A10
• A11
• A12
• Air conditioning system
• B10
• B11
• B12
• Battery feed
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• C250
• C251
• Crank signal
• Crnk fuse 10a
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector (behind left side of shipping panel)
• Diagnostic test terminal
• Ecm bat fuse 10a
• Ecm-crnk fuse 10a
• Ect signal
• Egr control
• Engine coolant temperature sensor (top front of engine)
• Fuel pump relay
• Fuel pump signal
• Fuse block
• G125 (front of engine)
• Hot at all times
• Hot in run, bulb test, or start
• Hot in start
• Iac a high
• Iac a low
• Iac b high
• Iac b low
• Ic bypass
• Ic control
• Ic reference high
• Ic reference low
• Idle air control actuator (top rear of engine)
• Ign ecm fused
• Inj fuse 7.5a
• Injector 1 control
• Injector 2 control
• Knock signal
• Malfunction indicator lamp
• Manifold absolute pressure sensor (top rear of engine)
• Map sensor ground
• Map signal
• Oxygen sensor ground
• Oxygen sensor signal
• Powertrain control module (left side of shipping panel)
• Red
• Sensor ground
• Serial data
• System ground
• Tan
• Throttle body fuel injector #1 (top of throttle body unit)
• Throttle body fuel injector #2 (top of throttle body unit)
• Throttle position sensor (top right side of engine)
• Tp signal
• Vss signal

4.3L (VIN Z), Engine Performance Wiring Diagrams, M/T Commercial Chassis (2 of 2) for GMC Forward Control P1994 3500

List of elements for 4.3L (VIN Z), Engine Performance Wiring Diagrams, M/T Commercial Chassis (2 of 2) for GMC Forward Control P1994 3500:

• (top rear
• 4.3l
• 5.7l
• Accy
• Alt fuse 20a
• Bulb test
• Distributor
• Egr electronic vacuum regulator solenoid valve (top right front of engine)
• Egr solenoid (top right side of engine)
• For tachometer
• Fuel pump and sender (in fuel tank)
• Fuel pump oil pressure switch (top rear of engine)
• Fuel pump prime connector
• Fuel pump relay (lower left side of shipping panel)
• Fuse block
• G125 (at generator bracket)
• G125 (front of engine
• G125 (front of engine)
• G402 (along left frame rail near fuel tank)
• G402 (left frame rail near fuel tank)
• Heated oxygen sensor (in exhaust manifold)
• Hot at all times
• Hot in run, bulb test, or start
• Ignition coil (top of engine near distributor)
• Ignition switch
• Instrument cluster
• Knock sensor (right side of engine)
• Knock sensor module (top right side of engine)
• Lock
• Malfunction (service engine soon) indicator
• Nca
• Of engine)
• Off
• Oxygen sensor (in exhaust manifold)
• Pnk
• Pnk b
• Provisions
• Red
• Run
• Start
• Vehicle speed sensor (left rear of transmission)
• Vehicle speed sensor buffer (behind right side of i/p)

5.7L

5.7L (VIN K), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (1 of 3) for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (1 of 3) for GMC Forward Control P1994 3500:

• 1-2 shift solenoid control
• 2-3 shift solenoid control
• 4.3l
• 4.3l only
• 5.7l
• 5.7l only
• 7.4l
• 7.4l only
• A/c signal
• A10
• A11
• A12
• A13
• A14
• A15
• A16
• Air condition- ing system
• B10
• B11
• B12
• B13
• B14
• B15
• B16
• Battery feed
• Brake signal
• C308
• C311
• Canister purge control
• Cruise control system
• Cruise signal
• Diagnostic test
• E10
• E11
• E12
• E13
• E14
• E15
• E16
• Ecm bat fuse 10a
• Ecm crnk fuse 10a
• Ect signal
• Egr control
• Egr electonic vacuum regulator soleniod valve (top right front of engine)
• Egr pintle position signal
• Evaporative canister purge control solenoid (top right side of engine)
• Exhaust gas recirculation valve solenoid (top right side of engine)
• F10
• F11
• F12
• F13
• F14
• F15
• F16
• Fuel pump relay ctrl
• Fuel pump signal
• Fuse block
• G125 (front of engine)
• Governor control
• Hot at all times
• Hot in run, bulb test, or start
• Iac "a" high
• Iac "a" low
• Iac "b" high
• Iac "b" low
• Ic bypass
• Ic control
• Ic ref hi
• Ic ref lo
• Idle air control actuator (top rear of engine)
• Idle speed actuator control solenoid (no location available)
• Idle speed actuator ctrl
• Ignition feed
• Inj fuse 7.5a
• Injector 1 control
• Injector 2 control
• Input speed signal high
• Input speed signal low
• Knock sensor input
• Knock signal
• Linear egr vacuum regulator solenoid valve (top front of engine)
• Map signal
• Mil control
• O2s 5.7l & 7.4l h2os 4.3l
• Oxygen sensor ground
• Pcs high
• Pcs low
• Pnk
• Powertrain control module (left side of shipping panel)
• Range signal a
• Range signal b
• Range signal c
• Red
• Sensor ground
• Sensor ref
• Serial data
• System ground
• Tan
• Tcc solenoid control
• Tft signal
• Throttle body fuel injector #1 (top of throttle body unit)
• Throttle body fuel injector #2 (top of throttle body unit)
• Tp reference
• Tp sensor signal
• Transmission input speed sensor (no location)
• Transmission output speed
• Vss signal

5.7L (VIN K), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (2 of 3) for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (2 of 3) for GMC Forward Control P1994 3500:

• (center rear
• 4.3l and 7.4l
• 5.7l
• Accy
• Alt fuse 20a
• Bulb test
• Distributor
• Engine coolant temperature sensor (top front of engine)
• Fuse block
• G125 (at generator bracket)
• Hot at all times
• Hot in run, bulb test, or start
• Ignition coil (top right rear of engine)
• Ignition switch
• Instrument cluster
• Knock sensor (left rear of engine, near oil pressure sender)
• Knock sensor module (top right side of engine)
• Lock
• Malfunction (service engine soon) indicator
• Manifold absolute pressure sensor (above valve cover)
• Nca
• Of engine)
• Off
• Pnk
• Pnk b
• Pnk/
• Provisions for tachometer
• Red
• Run
• Start
• Tcc/brake switch (on brake pedal support bracket)
• Throttle position sensor (on throttle body)
• Trans fuse 10a

5.7L (VIN K), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (3 of 3) for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (3 of 3) for GMC Forward Control P1994 3500:

• 1-2 shift soleniod
• 2-3 shift soleniod
• 4.3l
• 5.7l and 7.4l
• Bh conn pin h2
• Data link connector (behind left side of shipping panel)
• Ecm-bat fuse 10a
• Electronic 4-speed automatic overdrive transmission
• Fuel pump and sender (in fuel tank)
• Fuel pump oil pressure switch (top rear of engine)
• Fuel pump prime connector (no location available)
• Fuel pump relay (lower left side of shipping panel)
• Fuse block
• G125 (at generator bracket)
• G125 (front of engine near thermostat)
• G402 (left frame rail near fuel tank)
• Heated oxygen sensor (in exhaust manifold)
• Hot at all times
• Nca
• Oxygen sensor (in exhaust manifold)
• Pnk
• Pressure control solenoid
• Range mode selector
• Red
• Torque converter clutch solenoid
• Trans- mission temp sensor
• Vehicle speed sensor (left rear of transmission)
• Vehicle speed sensor buffer (behind right side of i/p)

5.7L (VIN K), Engine Performance Wiring Diagrams, A/T P/G Cutaway (1 of 3) for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, A/T P/G Cutaway (1 of 3) for GMC Forward Control P1994 3500:

• 1-2 shift solenoid control
• 2-3 shift solenoid control
• 5.7l
• 5.7l only
• 7.4l
• 7.4l only
• A/c signal
• A10
• A11
• A12
• A13
• A14
• A15
• A16
• Air condition- ing system
• B10
• B11
• B12
• B13
• B14
• B15
• B16
• Battery feed
• Brake signal
• C308
• C311
• Canister purge control
• Diagnostic test
• E10
• E11
• E12
• E13
• E14
• E15
• E16
• Ecm-i fuse 20a
• Ect signal
• Egr control
• Egr pintle position signal
• Evaporative canister purge control solenoid (top right side of engine)
• Exhaust gas recirculation valve solenoid (top right side of engine)
• F10
• F11
• F12
• F13
• F14
• F15
• F16
• Fuel pump relay ctrl
• Fuel pump signal
• Fuse block
• G102 (right front of engine)
• G125 (at generator bracket)
• G125 (front of engine)
• Hot in run, bulb test, or start
• Iac "a" high
• Iac "a" low
• Iac "b" high
• Iac "b" low
• Ic bypass
• Ic control
• Ic ref hi
• Ic ref lo
• Idle air control actuator (top rear of engine)
• Idle speed actuator control solenoid (no location available)
• Idle speed actuator ctrl
• Ignition feed
• Injector 1 control
• Injector 2 control
• Input speed signal high
• Input speed signal low
• Knock signal
• Linear egr vacuum regulator solenoid valve (top front of engine)
• Map signal
• Mil control
• Nca
• O2s
• Oxygen sensor (in exhaust manifold)
• Oxygen sensor ground
• Pcs high
• Pcs low
• Pnk
• Powertrain control module (left side of shipping panel)
• Range signal a
• Range signal b
• Range signal c
• Red
• Sensor ground
• Sensor ref
• Serial data
• System ground
• Tan
• Tcc solenoid control
• Tft signal
• Throttle body fuel injector #1 (top of throttle body unit)
• Throttle body fuel injector #2 (top of throttle body unit)
• Tp reference
• Tp sensor signal
• Transmission input speed sensor (left side of transmission)
• Transmission output speed
• Vss signal

5.7L (VIN K), Engine Performance Wiring Diagrams, A/T P/G Cutaway (2 of 3) for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, A/T P/G Cutaway (2 of 3) for GMC Forward Control P1994 3500:

• (center rear
• Accy
• Bulb test
• Distributor
• Engine coolant temperature sensor (top front of engine)
• Fuse block
• Gages fuse 20a
• Hot at all times
• Hot in run, bulb test, or start
• Ignition coil (top right rear of engine)
• Ignition switch
• Instrument cluster
• Knock sensor (left rear of engine, near oil pressure sender)
• Lock
• Malfunction (service engine soon) indicator
• Manifold absolute pressure sensor (above valve cover)
• Nca
• Of engine)
• Off
• Pnk
• Pnk b
• Pnk/
• Provisions for tachometer
• Red
• Run
• Start
• Tcc/brake switch (on brake pedal support bracket)
• Throttle position sensor (on throttle body)
• Trans fuse 10a

5.7L (VIN K), Engine Performance Wiring Diagrams, A/T P/G Cutaway (3 of 3) for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, A/T P/G Cutaway (3 of 3) for GMC Forward Control P1994 3500:

• 1-2 shift soleniod
• 2-3 shift soleniod
• Bh conn pin h2
• Data link connector (behind left side of shipping panel)
• Electronic 4-speed automatic overdrive transmission
• Fuel pump and sender (in fuel tank)
• Fuel pump fuse 20a
• Fuel pump oil pressure switch (top rear of engine)
• Fuel pump prime connector (top of cowl)
• Fuel pump relay (lower left side of shipping panel)
• Fuse block
• G125 (at generator bracket)
• G125 (front of engine near thermostat)
• G402 (left frame rail near fuel tank)
• Hot at all times
• Nca
• Pnk
• Pressure control solenoid
• Range mode selector
• Red
• Torque converter clutch solenoid
• Trans- mission temp sensor
• Vehicle speed sensor (left rear of transmission)
• Vehicle speed sensor buffer (behind right side of i/p)

5.7L (VIN K), Engine Performance Wiring Diagrams, M/T Commercial Chassis (1 of 2) for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, M/T Commercial Chassis (1 of 2) for GMC Forward Control P1994 3500:

• 5 volt ref
• A/c signal
• A10
• A11
• A12
• Air conditioning system
• B10
• B11
• B12
• Battery feed
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• C250
• C251
• Crank signal
• Crnk fuse 10a
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector (behind left side of shipping panel)
• Diagnostic test terminal
• Ecm bat fuse 10a
• Ecm-crnk fuse 10a
• Ect signal
• Egr control
• Engine coolant temperature sensor (top front of engine)
• Fuel pump relay
• Fuel pump signal
• Fuse block
• G125 (front of engine)
• Hot at all times
• Hot in run, bulb test, or start
• Hot in start
• Iac a high
• Iac a low
• Iac b high
• Iac b low
• Ic bypass
• Ic control
• Ic reference high
• Ic reference low
• Idle air control actuator (top rear of engine)
• Ign ecm fused
• Inj fuse 7.5a
• Injector 1 control
• Injector 2 control
• Knock signal
• Malfunction indicator lamp
• Manifold absolute pressure sensor (top rear of engine)
• Map sensor ground
• Map signal
• Oxygen sensor ground
• Oxygen sensor signal
• Powertrain control module (left side of shipping panel)
• Red
• Sensor ground
• Serial data
• System ground
• Tan
• Throttle body fuel injector #1 (top of throttle body unit)
• Throttle body fuel injector #2 (top of throttle body unit)
• Throttle position sensor (top right side of engine)
• Tp signal
• Vss signal

5.7L (VIN K), Engine Performance Wiring Diagrams, M/T Commercial Chassis (2 of 2) for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Engine Performance Wiring Diagrams, M/T Commercial Chassis (2 of 2) for GMC Forward Control P1994 3500:

• (top rear
• 4.3l
• 5.7l
• Accy
• Alt fuse 20a
• Bulb test
• Distributor
• Egr electronic vacuum regulator solenoid valve (top right front of engine)
• Egr solenoid (top right side of engine)
• For tachometer
• Fuel pump and sender (in fuel tank)
• Fuel pump oil pressure switch (top rear of engine)
• Fuel pump prime connector
• Fuel pump relay (lower left side of shipping panel)
• Fuse block
• G125 (at generator bracket)
• G125 (front of engine
• G125 (front of engine)
• G402 (along left frame rail near fuel tank)
• G402 (left frame rail near fuel tank)
• Heated oxygen sensor (in exhaust manifold)
• Hot at all times
• Hot in run, bulb test, or start
• Ignition coil (top of engine near distributor)
• Ignition switch
• Instrument cluster
• Knock sensor (right side of engine)
• Knock sensor module (top right side of engine)
• Lock
• Malfunction (service engine soon) indicator
• Nca
• Of engine)
• Off
• Oxygen sensor (in exhaust manifold)
• Pnk
• Pnk b
• Provisions
• Red
• Run
• Start
• Vehicle speed sensor (left rear of transmission)
• Vehicle speed sensor buffer (behind right side of i/p)

6.5L

6.5L (VIN F), Engine Performance Wiring Diagrams (1 of 2) for GMC Forward Control P1994 3500

List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams (1 of 2) for GMC Forward Control P1994 3500:

• 1-2 shift sol
• 1-2 shift sol ctrl
• 2-3 shift sol
• 2-3 shift sol ctrl
• 5v ref
• A range mode selector
• Accelerator pedal position (app) module (top of accelerator bracket)
• App 1 sens 5v ref
• App 1 sens gnd
• App 1 sensor
• App 2 sens gnd
• App 2 sensor
• App 3 sens 5v ref
• App 3 sens gnd
• App 3 sensor
• App sens 1 sig
• App sens 2 sig
• B/h
• Baro sig
• Battery feed
• Block
• Boost sig
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• Ckp sig
• Closure grd
• Control
• Cruise
• Cruise on/off sig
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector (no location available)
• E10
• E11
• E12
• E13
• E14
• E15
• E16
• Ect sig
• Electronic 4-speed automatic overdrive transmission
• Eng shut-off ctrl
• Engine coolant temperature (ect) sensor (right side of engine)
• Engine ground (no location available)
• Engine shut- off solenoid (top front of engine)
• F10
• F11
• F12
• F13
• F14
• F15
• F16
• Fuel inj ctrl
• Fuel inj sig
• Fuel solenoid (top front of engine)
• Fuel solenoid driver (top front of engine)
• Fuse
• Fusible link (no location available)
• Glow plug rly ctrl
• Hi resolution sig
• Hot at all times
• Hot in start or run
• Mil
• Optical sens 5v ref
• Optical sens cam sig
• Optical sens gnd
• Optical sensor and fuel temper- ature sensor (top front of engine)
• Pnk
• Powertrain control module (pcm) (no location available)
• Press ctrl sol
• Press ctrl sol lo
• Pressure control sol
• Range signal a
• Range signal b
• Range signal c
• Red
• Resume/accel sig
• Sensor gnd
• Serial data
• Set/coast sig
• System
• System gnd
• Tan
• Tcc brake sw
• Tcc sol
• Tcc sol ctrl (pwm)
• Trans fluid temp (tft) sensor
• Trans fluid temp sig
• Trans fuse 10a
• Trans input spd hi
• Trans input spd lo
• Trans output
• Trans output spd sig
• Transmission input speed sensor
• Vehicle speed sensor (left rear side of transmission)
• Vehicle speed sensor buffer (no location available)
• Vss
• Vss input
• Vss output

6.5L (VIN F), Engine Performance Wiring Diagrams (2 of 2) for GMC Forward Control P1994 3500

List of elements for 6.5L (VIN F), Engine Performance Wiring Diagrams (2 of 2) for GMC Forward Control P1994 3500:

• "service engine soon" lamp
• "service throttle" lamp
• (no location available)
• (on brake
• (upper rear of engine)
• A/c sig
• A10
• A11
• A12
• Air conditioning system
• All times
• Alt fuse 20a
• App 2 sens 5v ref
• App 3 sens sig
• B10
• B11
• B12
• Baro sensor (no location available)
• C red
• Crankshaft position sensor (top front of engine, inside
• Cruise ctrl brake sig
• Diagnostic request
• Ecm-crnk fuse 10a
• Fuel heater (no location available)
• Fuel pump (no location available)
• Fuel pump oil pressure switch
• Fuel pump relay (no location available)
• Fuel temp sig
• Fuse block
• Fusible link
• Fusible links
• Glow plug control relay (right rear top of engine)
• Glow plug sig
• Ground
• Ground (no location available)
• Hot at
• Hot at all times
• Hot in run, bulb test or start
• Hot in start or run
• Iat sig
• Ignition feed
• Injection pump)
• Injection timing stepper (its) motor (top front of engine)
• Instrument cluster
• Instrument clusters system
• Intake air temperature (iat) sensor (at front of engine)
• Its coil 1 hi
• Its coil 1 lo
• Its coil 2 hi
• Its coil 2 lo
• Left bank glow plugs
• Manifold absolute pressure sensor (no location available)
• Pedal
• Pnk
• Powertrain control module (pcm) (no location available)
• Red
• Right bank glow plugs
• Starting/ charging system
• Stop fuse 15a
• Stop lamp/ cruise control brake switch (on brake pedal support)
• Support)
• Switch
• Tan
• Tcc brake
• Wait lamp
• Wastegate sol ctrl
• Wastegate solenoid (left rear top of engine)

6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T for GMC Forward Control P1994 3500

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, A/T for GMC Forward Control P1994 3500:

• (16 ga-rust)
• (18 ga-rust)
• (at generator bracket)
• (in i/p harness)
• (instrument cluster)
• 1-2 shift sol
• 1-2 shift sol ctrl
• 2-3 shift sol
• 2-3 shift sol ctrl
• 5 volts ref
• A/c input
• A10
• A11
• A12
• Accy
• Air condi- tioning system
• Alt fuse 20a
• B/h
• B10
• B11
• B12
• Battery feed
• Brake signal
• Bulb test
• C pnk
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• Cold advance fast idle temperature switch (right rear of engine)
• Cold advance solenoid (top front of engine)
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector (behind left side shipping panel)
• Diagnostic test
• Diode
• Ecm bat fuse 10a
• Ecm crank fuse 10a
• Electronic 4-speed automatic overdrive transmission
• Engine speed sensor (top center of engine)
• Engine speed signal
• Fast idle solenoid (top left side of engine)
• Fuel heater (top rear of engine)
• Fuel shut- off solenoid (top front of engine)
• Fuse block
• Fusible link
• Fusible link (20 ga-
• Fusible links
• G125
• G125 (front of engine)
• Glow plug controller (left side of engine)
• Glow plug wait lamp
• Hot at all times
• Hot in crank
• Hot in run bulb test or start
• Ignition
• Inputs
• Instrument cluster
• Left bank glow plugs
• Lock
• Map sens
• Map sensor (left side of shipping panel)
• Nca
• Off
• Pcs hi
• Pcs lo
• Pnk
• Pnk d
• Pressure control solenoid
• Range mode selector
• Range signal a
• Range signal b
• Range signal c
• Red
• Red f
• Right bank glow plugs
• Run
• Rust)
• Sensor ground
• Serial data
• Service trans output
• Start
• System ground
• Tcc control
• Tcc sol
• Tcc/brake switch (on brake pedal support)
• Throttle position sensor (top center of engine)
• Tp sensor input
• Tran- smission fluid temp (tft) sensor
• Trans fluid temp sig
• Trans fuse 10a
• Trans input spd hi
• Trans input spd lo
• Trans lamp
• Transmission control module (tcm) (behind left side of shipping panel)
• Transmission input speed sensor (left side of transmission)
• Vehicle spd output vss
• Vehicle speed input
• Vehicle speed sensor (rear of transmission)
• Vehicle speed sensor buffer (under right side of i/p)
• Water- in-fuel indicator
• Water-in- fuel sensor (top rear of engine)

6.5L (VIN Y), Engine Performance Wiring Diagrams, M/T for GMC Forward Control P1994 3500

List of elements for 6.5L (VIN Y), Engine Performance Wiring Diagrams, M/T for GMC Forward Control P1994 3500:

• (18 ga-rust)
• (no location available)
• (on starter motor)
• Accy
• Alt fuse 20a
• Bulb test
• Cold advance fast idle temperature switch (right rear of engine)
• Cold advance solenoid (top front of engine)
• Fast idle solenoid (top left side of engine)
• Fuel heater (top rear of engine)
• Fuel shut- off solenoid (top front of engine)
• Fuse block
• Fusible link (12 ga-
• Fusible link (20 ga-
• Fusible links
• G125 (front of engine)
• Glow plug controller (left side of engine)
• Glow plug wait lamp
• Ground (no location available)
• Hot at all times
• Hot in run or start
• Hot in start
• Instrument cluster
• Left bank glow plugs
• Lock
• Nca
• Off
• Pnk
• Red
• Right bank glow plugs
• Run
• Rust)
• Start
• Water- in-fuel indicator
• Water-in fuel sensor (top rear of engine)

7.4L

7.4L (VIN N), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (1 of 3) for GMC Forward Control P1994 3500

List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (1 of 3) for GMC Forward Control P1994 3500:

• 1-2 shift solenoid control
• 2-3 shift solenoid control
• 4.3l
• 4.3l only
• 5.7l
• 5.7l only
• 7.4l
• 7.4l only
• A/c signal
• A10
• A11
• A12
• A13
• A14
• A15
• A16
• Air condition- ing system
• B10
• B11
• B12
• B13
• B14
• B15
• B16
• Battery feed
• Brake signal
• C308
• C311
• Canister purge control
• Cruise control system
• Cruise signal
• Diagnostic test
• E10
• E11
• E12
• E13
• E14
• E15
• E16
• Ecm bat fuse 10a
• Ecm crnk fuse 10a
• Ect signal
• Egr control
• Egr electonic vacuum regulator soleniod valve (top right front of engine)
• Egr pintle position signal
• Evaporative canister purge control solenoid (top right side of engine)
• Exhaust gas recirculation valve solenoid (top right side of engine)
• F10
• F11
• F12
• F13
• F14
• F15
• F16
• Fuel pump relay ctrl
• Fuel pump signal
• Fuse block
• G125 (front of engine)
• Governor control
• Hot at all times
• Hot in run, bulb test, or start
• Iac "a" high
• Iac "a" low
• Iac "b" high
• Iac "b" low
• Ic bypass
• Ic control
• Ic ref hi
• Ic ref lo
• Idle air control actuator (top rear of engine)
• Idle speed actuator control solenoid (no location available)
• Idle speed actuator ctrl
• Ignition feed
• Inj fuse 7.5a
• Injector 1 control
• Injector 2 control
• Input speed signal high
• Input speed signal low
• Knock sensor input
• Knock signal
• Linear egr vacuum regulator solenoid valve (top front of engine)
• Map signal
• Mil control
• O2s 5.7l & 7.4l h2os 4.3l
• Oxygen sensor ground
• Pcs high
• Pcs low
• Pnk
• Powertrain control module (left side of shipping panel)
• Range signal a
• Range signal b
• Range signal c
• Red
• Sensor ground
• Sensor ref
• Serial data
• System ground
• Tan
• Tcc solenoid control
• Tft signal
• Throttle body fuel injector #1 (top of throttle body unit)
• Throttle body fuel injector #2 (top of throttle body unit)
• Tp reference
• Tp sensor signal
• Transmission input speed sensor (no location)
• Transmission output speed
• Vss signal

7.4L (VIN N), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (2 of 3) for GMC Forward Control P1994 3500

List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (2 of 3) for GMC Forward Control P1994 3500:

• (center rear
• 4.3l and 7.4l
• 5.7l
• Accy
• Alt fuse 20a
• Bulb test
• Distributor
• Engine coolant temperature sensor (top front of engine)
• Fuse block
• G125 (at generator bracket)
• Hot at all times
• Hot in run, bulb test, or start
• Ignition coil (top right rear of engine)
• Ignition switch
• Instrument cluster
• Knock sensor (left rear of engine, near oil pressure sender)
• Knock sensor module (top right side of engine)
• Lock
• Malfunction (service engine soon) indicator
• Manifold absolute pressure sensor (above valve cover)
• Nca
• Of engine)
• Off
• Pnk
• Pnk b
• Pnk/
• Provisions for tachometer
• Red
• Run
• Start
• Tcc/brake switch (on brake pedal support bracket)
• Throttle position sensor (on throttle body)
• Trans fuse 10a

7.4L (VIN N), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (3 of 3) for GMC Forward Control P1994 3500

List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T Commercial Chassis and Motorhome (3 of 3) for GMC Forward Control P1994 3500:

• 1-2 shift soleniod
• 2-3 shift soleniod
• 4.3l
• 5.7l and 7.4l
• Bh conn pin h2
• Data link connector (behind left side of shipping panel)
• Ecm-bat fuse 10a
• Electronic 4-speed automatic overdrive transmission
• Fuel pump and sender (in fuel tank)
• Fuel pump oil pressure switch (top rear of engine)
• Fuel pump prime connector (no location available)
• Fuel pump relay (lower left side of shipping panel)
• Fuse block
• G125 (at generator bracket)
• G125 (front of engine near thermostat)
• G402 (left frame rail near fuel tank)
• Heated oxygen sensor (in exhaust manifold)
• Hot at all times
• Nca
• Oxygen sensor (in exhaust manifold)
• Pnk
• Pressure control solenoid
• Range mode selector
• Red
• Torque converter clutch solenoid
• Trans- mission temp sensor
• Vehicle speed sensor (left rear of transmission)
• Vehicle speed sensor buffer (behind right side of i/p)

7.4L (VIN N), Engine Performance Wiring Diagrams, A/T P/G Cutaway (1 of 3) for GMC Forward Control P1994 3500

List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T P/G Cutaway (1 of 3) for GMC Forward Control P1994 3500:

• 1-2 shift solenoid control
• 2-3 shift solenoid control
• 5.7l
• 5.7l only
• 7.4l
• 7.4l only
• A/c signal
• A10
• A11
• A12
• A13
• A14
• A15
• A16
• Air condition- ing system
• B10
• B11
• B12
• B13
• B14
• B15
• B16
• Battery feed
• Brake signal
• C308
• C311
• Canister purge control
• Diagnostic test
• E10
• E11
• E12
• E13
• E14
• E15
• E16
• Ecm bat fuse 10a
• Ecm-i fuse 20a
• Ect signal
• Egr control
• Egr pintle position signal
• Evaporative canister purge control solenoid (top right side of engine)
• Exhaust gas recirculation valve solenoid (top right side of engine)
• F10
• F11
• F12
• F13
• F14
• F15
• F16
• Fuel pump relay ctrl
• Fuel pump signal
• Fuse block
• G125 (at generator bracket)
• G125 (front of engine)
• Hot at all times
• Hot in run, bulb test, or start
• Iac "a" high
• Iac "a" low
• Iac "b" high
• Iac "b" low
• Ic bypass
• Ic control
• Ic ref hi
• Ic ref lo
• Idle air control actuator (top rear of engine)
• Idle speed actuator control solenoid (no location available)
• Idle speed actuator ctrl
• Ignition feed
• Injector 1 control
• Injector 2 control
• Input speed signal high
• Input speed signal low
• Knock signal
• Linear egr vacuum regulator solenoid valve (top front of engine)
• Map signal
• Mil control
• Nca
• O2s
• Oxygen sensor (in exhaust manifold)
• Oxygen sensor ground
• Pcs high
• Pcs low
• Pnk
• Powertrain control module (left side of shipping panel)
• Range signal a
• Range signal b
• Range signal c
• Red
• Sensor ground
• Sensor ref
• Serial data
• System ground
• Tan
• Tcc solenoid control
• Tft signal
• Throttle body fuel injector #1 (top of throttle body unit)
• Throttle body fuel injector #2 (top of throttle body unit)
• Tp reference
• Tp sensor signal
• Transmission input speed sensor (left side of transmission)
• Transmission output speed
• Vss signal

7.4L (VIN N), Engine Performance Wiring Diagrams, A/T P/G Cutaway (2 of 3) for GMC Forward Control P1994 3500

List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T P/G Cutaway (2 of 3) for GMC Forward Control P1994 3500:

• (center rear
• Accy
• Bulb test
• Distributor
• Engine coolant temperature sensor (top front of engine)
• Fuse block
• Gages fuse 20a
• Hot at all times
• Hot in run, bulb test, or start
• Ignition coil (top right rear of engine)
• Ignition switch
• Instrument cluster
• Knock sensor (left rear of engine, near oil pressure sender)
• Lock
• Malfunction (service engine soon) indicator
• Manifold absolute pressure sensor (above valve cover)
• Nca
• Of engine)
• Off
• Pnk
• Pnk b
• Pnk/
• Provisions for tachometer
• Red
• Run
• Start
• Tcc/brake switch (on brake pedal support bracket)
• Throttle position sensor (on throttle body)
• Trans fuse 10a

7.4L (VIN N), Engine Performance Wiring Diagrams, A/T P/G Cutaway (3 of 3) for GMC Forward Control P1994 3500

List of elements for 7.4L (VIN N), Engine Performance Wiring Diagrams, A/T P/G Cutaway (3 of 3) for GMC Forward Control P1994 3500:

• 1-2 shift soleniod
• 2-3 shift soleniod
• Bh conn pin h2
• Data link connector (behind left side of shipping panel)
• Electronic 4-speed automatic overdrive transmission
• Fuel pump and sender (in fuel tank)
• Fuel pump fuse 20a
• Fuel pump oil pressure switch (top rear of engine)
• Fuel pump prime connector (top of cowl)
• Fuel pump relay (lower left side of shipping panel)
• Fuse block
• G125 (at generator bracket)
• G125 (front of engine near thermostat)
• G402 (left frame rail near fuel tank)
• Hot at all times
• Nca
• Pnk
• Pressure control solenoid
• Range mode selector
• Red
• Torque converter clutch solenoid
• Trans- mission temp sensor
• Vehicle speed sensor (left rear of transmission)
• Vehicle speed sensor buffer (behind right side of i/p)

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500

List of elements for Ground Distribution Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500:

• manual transmission
• (at generator bracket)
• (rear of cylinder head)
• (right frame rail, near battery)
• (right rear of engine)
• ** with schoolbus equipment
• A12
• Battery (gasoline engines)
• Brake/ transmission shift interlock relay
• Brake/ transmission shift interlock solenoid
• C212
• C250
• C251
• C252
• Convenience center
• Data link conn- ector
• Data link connector
• Daytime running lamp module
• Daytime running lamp relay
• Egr electronic vacuum regulator solenoid valve
• Engine coolant level sensor
• For left side marker
• For right side marker
• Fuel cycle module
• Fuel heater
• Fuel pump
• Fuel pump relay
• G# n/a (in i/p harness)
• G# n/a (in forward lamps harness)
• G# n/a (in i/p harness)
• G# n/a (in rear lamps harness)
• G#s n/a (in forward lamps harness)
• G105
• G109 (right side of radiator support)
• G110 (front of left cylinder head)
• G117
• G119 (front of right cylinder head)
• G125
• G125 (at generator bracket)
• G125 (front of engine)
• G125 (front of engine)
• G402 (along left frame rail, near fuel tank)
• Glow plug controller
• Heated oxygen sensor
• I/p cluster
• Knock sensor system module
• Left (or rear ) battery
• Left high/ low headlamp
• Not used
• Panel dimmer switch
• Park brake switch
• Powertrain control module (pcm)
• Provisions provisions
• Right (or front ) battery
• Right high/ low headlamp
• Starter relay
• Tan
• Transmission control module
• Transmission range indicator lamp
• Vehicle speed sensor buffer
• W/ automatic transmission
• W/ automatic transmissions
• W/ daytime running lights
• W/ diesel engine
• W/ diesel engines
• W/ gasoline engines
• W/ l05 engine
• W/ schoolbus equipment
• Washer pump
• Water- in-fuel sensor
• Wiper motor

Ground Distribution Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500

List of elements for Ground Distribution Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500:

• (canada only)
• A/c compressor
• A/c compressor pressure cycling switch
• A12
• Audio alarm module
• Battery
• Blower motor
• Blower relay
• Brake/ shift interlock relay
• Brake/ transmission shift interlock solenoid
• Bus bar ground
• C228
• C236a
• C250
• Cigarette lighter
• Cruise control module
• Data link conn- ector
• Daytime running lamps module
• Daytime running lamps relay
• Egr electronic vacuum regulator valve solenoid
• Flow switch (brakes)
• Fuel pump
• Fuel pump relay
• G110 (left lower front of engine)
• G111 (engine compartment behind battery)
• G111 (engine compartment, behind battery)
• G114 (at rear of left cylinder head)
• G123 (engine compartment, above right headlamp)
• G125 (top right front of engine at thermostat housing)
• G202 (at bus bar ground)
• G402 (along left frame rail, on rear crossmember)
• Heater control lamp
• In-line diode
• Instrument cluster
• Left high beam headlamp
• Left horn
• Left low beam headlamp
• Left park and turn lamp
• Left park lamp
• Left power window switch
• Left side marker lamp
• Left tail stop and turn lamp
• License lamp ground (from body builder)
• Light switch
• Power door lock relay
• Powertrain control module (pcm)
• Provisions for clearance lamps
• Provisions for rear marker lamps
• Radio
• Right high beam headlamp
• Right horn
• Right low beam headlamp
• Right park and turn lamp
• Right park lamp
• Right side marker lamp
• Right tail stop and turn lamp
• Safety belt retractor switch
• Tan
• Vehicle speed sensor buffer
• Windshield washer pump
• Windshield wiper motor module

Ground Distribution Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500

List of elements for Ground Distribution Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500:

• (right frame rail near battery)
• A/c compressor clutch
• A12
• Audio alarm module
• Auxilliary cooling fan
• Auxilliary cooling fan coolant pressure switch
• Battery
• Brake/ transmission shift interlock relay
• Brake/ transmission shift interlock solenoid
• C212
• C250
• Cruise control module
• Data link conn- ector
• Daytime running lamps module
• Daytime running lamps relay
• Fuel pump
• Fuel pump relay
• G# n/a (at left shipping panel)
• G# n/a (at left rear frame rail)
• G#s n/a (in forward lamps harness)
• G105
• G117 (right rear of engine)
• G125 (top right front of engine)
• G402 (at left rear frame rail)
• Headlamp dimmer switch
• I/p cluster
• Left high beam headlamp
• Left high/low beam headlamp
• Powertrain control module (pcm)
• Provisions for left side marker lamp
• Provisions for right side marker lamp
• Right high beam headlamp
• Right high/low beam headlamp
• Tan
• Transmission range indicator lamp
• Vehicle speed sensor buffer
• W/ daytime running lights
• Wiper washer switch

HEADLIGHTS

Headlamps Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500

List of elements for Headlamps Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500:

• (in forward lamps harness)
• (in i/p harness)
• Head
• Headlamp dimmer switch
• Hi beam indicator
• Hot at all times
• Instrument cluster
• Left hi headlamp assembly
• Light switch
• Off
• Park
• Right hi headlamp assembly
• Tan
• Tan b
• Tan c

Headlamps Wiring Diagram, Commercial Chassis with DRL for GMC Forward Control P1994 3500

List of elements for Headlamps Wiring Diagram, Commercial Chassis with DRL for GMC Forward Control P1994 3500:

• (at park brake, under left side of i/p)
• (in forward lamps harness)
• (in i/p harness)
• Bulb check
• Daytime running lamp indicator
• Daytime running lamps module (in i/p harness)
• Daytime running lamps relay (in i/p harness)
• Fog lamps
• Fuse block
• Ground
• Head
• Headlamp dimmer switch
• Headlight switch assembly
• Hi beam feed
• Hi beam indicator
• Horn/dm fuse 15a
• Hot at all times
• Hot in run
• Htr fuse 25a
• Ignition
• Instrument cluster
• Lamp feed
• Left headlamp assembly
• Off
• Output to relay
• Park
• Park brake warning switch
• Provisions for fog lamps
• Right headlamp assembly
• Tan

Headlamps Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500

List of elements for Headlamps Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500:

• (at bus
• Bar ground)
• G111 (engine compartment, behind battery)
• G202
• Head
• Headlamp dimmer switch
• Hi beam indicator
• Hot at all times
• Instrument cluster
• Left high beam headlamp assembly
• Left low beam headlamp assembly
• Light switch
• Off
• Park
• Right high beam headlamp assembly
• Right low beam headlamp assembly
• Tan
• Tan a

Headlamps Wiring Diagram, Cutaway Chassis with DRL for GMC Forward Control P1994 3500

List of elements for Headlamps Wiring Diagram, Cutaway Chassis with DRL for GMC Forward Control P1994 3500:

• (on park brake support bracket)
• Bulb check
• C12
• C17
• Daytime running lamp indicator
• Daytime running lamps module (behind left side of i/p)
• Daytime running lamps relay (behind left side of i/p, above steering column)
• Drl fuse 10a
• Fuse block
• G111 (engine compartment, behind battery)
• G202 (at bus bar ground)
• Gauges fuse 20a
• Ground
• Head
• Headlamp dimmer switch
• Headlight switch assembly
• Hi beam feed
• Hi beam indicator
• Hot at all times
• Hot in run or start
• Ignition
• Instrument cluster
• Lamp feed
• Left high beam headlamp
• Left low beam headlamp
• Off
• Output to relay
• Park
• Park brake warning switch
• Right high beam headlamp
• Right low beam headlamp
• Tan

Headlamps Wiring Diagram, Motor Home Chassis for GMC Forward Control P1994 3500

List of elements for Headlamps Wiring Diagram, Motor Home Chassis for GMC Forward Control P1994 3500:

• (at left shipping panel)
• (forward lamps harness)
• Head
• Headlamp dimmer switch
• Hi beam indicator
• Hot at all times
• Instrument cluster
• Left hi headlamp assembly
• Left lower head- lamp (w/ hpr)
• Light switch
• Off
• Park
• Right hi headlamp assembly
• Right lower head- lamp (w/ hpr)
• Tan
• Tan c

Headlamps Wiring Diagram, Motor Home Chassis with DRL for GMC Forward Control P1994 3500

List of elements for Headlamps Wiring Diagram, Motor Home Chassis with DRL for GMC Forward Control P1994 3500:

• (at left shipping panel)
• (at park brake, under left side of i/p)
• (in forward lamps harness)
• Bulb check
• Daytime running lamp cutoff relay (w/ hpr) (location not available)
• Daytime running lamp indicator
• Daytime running lamps module (in i/p harness)
• Daytime running lamps relay (in i/p harness)
• Fog lamps
• Fuse block
• G114 (left rear of engine)
• Ground
• Head
• Headlamp dimmer switch
• Headlight switch assembly
• Hi beam feed
• Hi beam indicator
• Horn/dm fuse 15a
• Hot at all times
• Hot in run or start
• Htr fuse 25a
• Ignition
• Instrument cluster
• Lamp feed
• Left headlamp assembly
• Left lower headlamp (w/ hpr)
• Off
• Output to relay
• Park
• Park brake warning switch
• Provisions for fog lamps
• Right headlamp assembly
• Right lower headlamp (w/ hpr)
• Tan

HORN

Horn Wiring Diagram for GMC Forward Control P1994 3500

List of elements for Horn Wiring Diagram for GMC Forward Control P1994 3500:

• (in i/p harness)
• Fuse block
• Horn (in forward lamps harness)
• Horn relay
• Horn switch
• Horn/dm fuse 15a
• Hot at all times
• Steering wheel (commercial chassis) turn signal switch (motorhome chassis)

Horn Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500

List of elements for Horn Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500:

• (in i/p harness)
• A-note horn (on left radiator support)
• F-note horn (on left radiator support)
• Fuse block
• G111 (left front of engine compartment, behind battery)
• Horn relay
• Horn switch
• Horn/dm fuse 15a
• Hot at all times
• Turn signal switch

INSTRUMENT CLUSTER

Instrument Cluster Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500

List of elements for Instrument Cluster Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500:

• (in i/p harness)
• *a5-4.3l(m/t) & 5.7l(m/t) e6-4.3l(a/t), 5.7l(a/t) & 7.4l
• Accy
• Alarm (in hydro- boost warning harness)
• Alt fuse 20a
• Audio alarm module (convenience center)
• Brake fluid level switch (rear of engine compt)
• Bulb test
• C251
• C253
• C292
• C299
• Coolant temp.
• Coolant temp. gauge
• Daytime running lamps module
• Daytime running lamps module (in i/p harness)
• Daytime running lamps relay
• Daytime running lights ind. (w/ drl)
• Diesel only
• Engine coolant level indicator module (in i/p harness)
• Engine coolant level indicator probe (in radiator)
• Engine coolant temperature sender (left side of engine)
• Exterior lights system
• Fasten belts ind.
• Flasher unit (in hydro- boost warning harness)
• Flow switch (at power brake booster module)
• Fuel gauge
• Fuel level
• Fuel pump & sender (top rear of engine)
• Fuel pump/ oil pressure switch & sender (left side of engine)
• Fuse block
• G125 (front of engine)
• Gauges fuse 20a
• Glow plug controller (rear of engine)
• Glow plugs ind. (diesel)
• Gnd
• Headlights system
• Hi beam ind.
• Hot in run
• Hot in run, bulb test or start
• Hot w/ lamp switch in park or head
• Hydro- boost pressure warning switch (in hydro- boost warning harness)
• I/p ground (in i/p harness)
• Ign
• Ignition switch
• Illum.
• Illum. lamps
• Instr-lps fuse 5a
• Instrument cluster
• Left turn ind.
• Lock
• Low coolant ind. (diesel)
• Mal- function ind.
• Off
• Oil press. gauge
• Oil press. signal
• Park brake ind.
• Park brake switch
• Pnk
• Powertrain control module (left side of shipping panel)
• Right turn ind.
• Run
• Service brakes ind.
• Service trans- mission ind. (diesel)
• Solid state
• Speed- ometer
• Start
• Tan
• Tan/
• Transmission control module (left side of shipping panel)
• Vehicle speed
• Vehicle speed sensor (left rear of transmission)
• Vehicle speed sensor buffer module (right side of i/p)
• Volt- meter
• W/ drl
• W/o drl
• Water in fuel ind. (diesel)
• Water-in-fuel sensor (rear of engine)

Instrument Cluster Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500

List of elements for Instrument Cluster Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500:

• (7.4l-top right front of engine)
• (along left frame rail, on rear crossmember)
• (at bus bar ground)
• (in fuel tank)
• Audio alarm module (convenience
• Brake ind.
• Brake pressure warning switch (on left frame rail)
• Brake warning alarm buzzer (behind left side of i/p, near fuse block)
• C208
• C301
• Center)
• Coolant temp.
• Coolant temp. gauge
• Daytime running lamps ind. (w/ drl)
• Daytime running lamps module (behind left side of i/p, above steering column)
• Daytime running lamps relay (behind left side of i/p, above steering column)
• Electronic delay module (behind left side of i/p,
• Engine coolant temperature sensor (5.7l-lower left side of engine)
• Exterior lights system
• Flow switch (near power steering pump)
• Fuel gauge
• Fuel level
• Fuel pump & sender
• Fuel pump oil pressure switch & sender (5.7l-top rear of engine) (7.4l-lower left side of engine)
• Fuse block
• G202
• G409
• Gages fuse 20a
• Gnd
• Headlights system
• Hi beam ind.
• Hot in run, bulb test or start
• Hot w/ lamp switch in park or head
• Hydro-boost pressure warning switch (near master cylinder)
• Ign
• Ignition switch
• Illum.
• Illum. lamp
• Illum. lamps
• In-line diode (behind left side of i/p, above fuse block)
• In-line diode (behind left side of i/p, above steering column)
• Instr lps fuse 5a
• Instrument cluster
• Left turn ind.
• Low coolant ind. (not used)
• Mal- function ind.
• Oil press. gauge
• Oil press. signal
• On park brake support bracket)
• Output speed sensor (left rear of transmission)
• Park brake warning switch
• Pnk/
• Powertrain control module (under driver's seat)
• Resistor (1.5k ohms, 0.5 watt)
• Right turn ind.
• Safety belt ind.
• Sheet metal ground
• Speed- ometer
• Tan
• Vehicle speed
• Vehicle speed sensor buffer (behind left side of i/p)
• Volt- meter
• W/ drl
• W/o drl

Instrument Cluster Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500

List of elements for Instrument Cluster Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500:

• (at left shipping panel)
• (in fuel tank)
• (left front of engine)
• (left rear frame rail)
• (right frame rail, near battery)
• (top right side of
• Accy
• Alt fuse 20a
• Audio alarm module (convenience center)
• Brake ind.
• Brake pressure warning switch (near master cylinder)
• Bulb test
• C205
• C251
• Coolant temp.
• Coolant temp. gauge
• Daytime running lamps module
• Daytime running lamps module (top right side of
• Daytime running lamps relay
• Daytime running lights ind. (w/ drl)
• Engine coolant temperature sender
• Exterior lights system
• Fuel gauge
• Fuel level
• Fuel pump & sender
• Fuse block
• G101
• G409
• Gnd
• Headlights system
• Hi beam ind.
• Hot in run, bulb test or start
• Hot w/ lamp switch in park or head
• I/p ground
• Ign
• Ignition switch
• Illum.
• Illum. lamps
• Instr-lps fuse 5a
• Instrument cluster
• Left turn ind.
• Lock
• Mal- function ind.
• Off
• Oil press. gauge
• Oil press. signal
• Oil pressure switch & sender (top rear of engine)
• Park brake ind.
• Park brake warning switch
• Powertrain control module (left side of i/p, behind shipping panel)
• Right turn ind.
• Run
• Safety belt ind.
• Shipping harness)
• Speed- ometer
• Start
• Tan
• Tan/
• Vehicle speed
• Vehicle speed sensor (on output shaft of transmission)
• Vehicle speed sensor buffer (inside left side of shipping panel)
• Volt- meter
• W/ drl
• W/o drl

INTERIOR LIGHTS

Interior Light Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500

List of elements for Interior Light Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500:

• (5) bulbs
• C17
• C261
• Dim
• Exterior lights system
• Fuse block
• G200 (left side of i/p)
• Head
• Headlight switch assembly
• Heater & a/c control illumination lamps
• High
• Horn/dm fuse 15a
• Hot at all times
• I/p lps fuse 5a
• Instrument cluster
• Light switch
• Off
• Panel dimmer switch assembly
• Park
• Provisions for dome lamps
• Tail lps fuse 20a

Interior Light Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500

List of elements for Interior Light Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500:

• (6) bulbs
• Audio alarm module
• C17
• C261
• Dim
• Dome switch
• Front dome lamp
• Fuse block
• G200 (left side of i/p)
• Head
• Headlight switch assembly
• High
• Horn/dm fuse 20a
• Hot at all times
• I/p lps fuse 5a
• Instrument cluster
• Left door jamb switch
• Light switch
• Lights on input
• Off
• Panel dimmer switch assembly
• Park
• Provisions for rear dome lamp
• Radio
• Solid state
• Tail lps fuse 20a
• Trans- mission range indicator lamp

Interior Light Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500

List of elements for Interior Light Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500:

• (6) bulbs
• C218
• Dim
• Dome lamp
• Dome switch
• Exterior lights system
• Fuse block
• G114 (left rear of engine)
• G200 (left side of i/p)
• Head
• Headlight switch assembly
• High
• Horn/dm fuse 15a
• Hot at all times
• I/p lps fuse 5a
• Instrument cluster
• Light switch
• Off
• Panel dimmer switch assembly
• Park
• Tail lps fuse 20a
• Transmission range indicator lamp

POWER DISTRIBUTION

Power Distribution Wiring Diagram, Commercial Chassis (Diesel) (1 of 2) for GMC Forward Control P1994 3500

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (Diesel) (1 of 2) for GMC Forward Control P1994 3500:

• (warning systems)
• Acc-radio fuse 10a
• Accy
• Battery junction block
• Body builder's
• Brake warning system
• Bulb test
• C16
• C298
• C299
• Clutch start switch
• Daytime running lamps
• Daytime running lamps relay
• Ecm-bat fuse 10a
• Engine coolant level indicator module
• From panel dimmer switch
• From park brake warning switch
• Fuel pump oil pressure switch
• Fuel pump relay
• Fuse block
• Fuse block & glow plug controller
• Fusible link e
• Fusible link f
• Gages fuse 20a
• Generator
• Hazard flasher
• Headlight switch assembly
• Horn relay
• Horn/dm fuse 15a
• Htr fuse 25a
• I/p cluster
• Ignition switch
• Instr-lps fuse 5a
• Instrument cluster printed circuit
• Junction block
• Left rear battery
• Link a fusible
• Link b fusible
• Link c fusible
• Link d fusible
• Lock
• Module
• Off
• Pnk
• Powertrain control module (pcm)
• Provisions for dome lamps
• Red
• Relay
• Right front battery
• Rst 10ga
• Rst 12ga
• Rst 14ga
• Rst 16ga
• Run
• Shunt
• Start
• Starter relay
• Starter solenoid
• Stop- hz fuse 15a
• Stoplamp switch
• Tail lps fuse 20a
• To glow plug controller
• Transmission range indicator lamp
• W/ auto transmission
• W/ manual transmission only
• Wiper fuse 25a
• Wiper motor
• Wiper switch

Power Distribution Wiring Diagram, Commercial Chassis (Diesel) (2 of 2) for GMC Forward Control P1994 3500

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (Diesel) (2 of 2) for GMC Forward Control P1994 3500:

• Alt fuse 20a
• Audio alarms
• Backup lamp switch (auto trans)
• Backup lamp switch (manual trans)
• C128
• C16
• C190
• Cold advance fast idle temperature switch
• Ecm-crank fuse 10a
• From fusible link a
• From ignition switch
• Fuel heater
• Fuse block
• Generator
• Glow plug controller
• I/p cluster
• Pnk
• Red
• Tcc/ brake switch
• Tcm
• Trans fuse 10a
• Transmission
• Transmission only
• Turn signal flasher
• Turn-b/u fuse 15a
• Vehicle speed sensor buffer
• Water-in-fuel sensor
• With automatic *
• With automatic transmission only
• With manual transmission only

Power Distribution Wiring Diagram, Commercial Chassis (Gasoline) (1 of 2) for GMC Forward Control P1994 3500

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (Gasoline) (1 of 2) for GMC Forward Control P1994 3500:

• (warning systems)
• 15a
• Acc bus
• Acc-radio fuse 10a
• Accy
• Alt, ecm-crank, turn-b/u, injector fuses
• Alt, ecm-crank, turn-b/u, trans, injector fuses
• Automatic transmission
• B batt bus
• Battery
• Battery junction block
• Body builder's
• Brake warning system
• Bulb test
• C16
• C298
• C299
• Clutch pedal switch
• Crank fuse 10a
• Daytime running lamps
• Daytime running lamps relay
• Ecm-bat fuse 10a
• Fuel cycle module
• Fuel pump oil pressure switch
• Fuel pump relay
• Fuse block
• Fusible
• Fusible link c rst 10ga
• Gages fuse 20a
• Generator
• Hazard flasher
• Headlight switch assembly
• Horn relay
• Horn/dm fuse
• Htr bus
• Htr fuse 25a
• I/p cluster
• Ignition switch
• Instr-lps fuse 5a
• Junction block
• Lock
• Manual transmission
• Module
• Off
• Panel dimmer switch (interior lights system)
• Park brake warning switch
• Pnk
• Powertrain control module (pcm)
• Powertrain control module (pcm) (with manual transmission only)
• Provisions for dome lamps
• Red
• Relay
• Rst 14ga link b
• Rst 16ga fusible link d
• Rst 16ga link a fusible
• Run
• Shunt
• Start
• Starter solenoid
• Stop-hz fuse 15a
• Stoplamp switch
• Tail lps fuse 20a
• Trans
• Transmission range indicator lamp
• W/ auto
• Wiper fuse 25a
• Wiper motor
• Wiper switch
• With manual transmission only

Power Distribution Wiring Diagram, Commercial Chassis (Gasoline) (2 of 2) for GMC Forward Control P1994 3500

List of elements for Power Distribution Wiring Diagram, Commercial Chassis (Gasoline) (2 of 2) for GMC Forward Control P1994 3500:

• (auto trans)
• (except vin k w/ manual transmission)
• (manual trans)
• All others
• Alt fuse 20a
• Audio alarm module
• Backup lamp switch
• Convenience center
• E15
• Ecm-crank fuse 10a
• Egr electronic vacuum
• Egr solenoid
• Evaporative canister purge solenoid
• Fuse block
• Generator
• Heated oxygen sensor (vin z w/ manual transmission)
• I/p cluster
• Idle speed control actuator
• Ignition coil
• Ignition switch
• Inj fuse 7.5a
• Injector #1
• Injector #2
• Knock sensor system (w/ manual transmission)
• Pcm
• Pnk
• Red
• Regulator solenoid valve (vin k only)
• Tcc/ brake switch
• Trans fuse 10a
• Transmission
• Turn signal flasher
• Turn-b/u fuse 15a
• Vehicle speed sensor buffer
• Vehicle speed sensor buffer (vin k w/ manual transmission)
• Vin k with heavy duty automatic transmission
• Vin n w/ automatic transmission
• W/ automatic transmission

Power Distribution Wiring Diagram, Cutaway Chassis (1 of 2) for GMC Forward Control P1994 3500

List of elements for Power Distribution Wiring Diagram, Cutaway Chassis (1 of 2) for GMC Forward Control P1994 3500:

• 20a
• 30a
• Accy
• Audio alarm module
• Backup lamp switch
• Battery
• Battery junction block
• Bulb test
• C112
• C214
• C215
• Cigarette lighter
• Daytime running lamps relay
• Dome lamp
• Door lock relay
• Drl fuse 10a
• E16
• Fuel pump
• Fuel pump fuse 20a
• Fuel pump oil pressure switch
• Fuse block
• Fusible
• Fusible link
• G202 (at bus bar ground)
• Generator
• Hazard flasher
• Heater blower switch
• Heater control lamps
• Horn relay
• Horn/dm fuse
• Htr a/c fuse 25a
• Ignition switch
• Instr-lps fuse 5a
• Instrument cluster printed circuit
• Left door lock switch
• Left power window switch
• Light switch
• Link
• Lock
• Off
• Pnk
• Powertrain control module (pcm)
• Pwr acc circuit breaker
• Pwr wdo circuit breaker 30a
• Radio
• Radio fuse 10a
• Red
• Right door lock switch
• Right power window switch
• Rst 10ga
• Rst 14ga
• Rst 16ga
• Rst 18ga
• Run
• Shunt
• Start
• Starter solenoid
• Stop-hz fuse 20a
• Stoplamp switch
• Tail lps fuse
• To emci, gages & trans fuses and ignition coil
• Transmission range indicator lamp
• Turn signal flasher
• Turn-b/u fuse 20a
• Windshield wiper motor module
• Windshield wiper/ washer switch
• Wiper fuse 25a

Power Distribution Wiring Diagram, Cutaway Chassis (2 of 2) for GMC Forward Control P1994 3500

List of elements for Power Distribution Wiring Diagram, Cutaway Chassis (2 of 2) for GMC Forward Control P1994 3500:

• Audio alarm module
• Brake warning alarm buzzer
• C118
• C304
• Daytime running lamps module
• Daytime running lamps relay
• E15
• Ecmi fuse 20a
• Egr electronic vacuum regulator solenoid valve
• Evaporative emissions canister purge valve
• F15
• Fuse block
• Gages fuse 10a
• Generator
• Idle speed control actuator
• Ignition coil
• Ignition switch
• Injector #1
• Injector #2
• Instrument cluster
• Mt1 transmission
• Pnk
• Powertrain control module (pcm)
• Powertrain control module (pcm) (vin k only)
• Red
• Shunt
• Tcc/ brake switch
• Trans fuse 10a
• Vehicle speed sensor buffer
• Vin n only

Power Distribution Wiring Diagram, Motorhome Chassis (1 of 2) for GMC Forward Control P1994 3500

List of elements for Power Distribution Wiring Diagram, Motorhome Chassis (1 of 2) for GMC Forward Control P1994 3500:

• 15a
• Acc-radio fuse 10a
• Accy
• Audio alarm
• Audio alarm module
• Aux
• Aux circuit breaker 30a
• Auxiliary cooling
• Auxiliary cooling fan relay
• Battery
• Battery junction block
• Brake pressure warning switch
• Bulb test
• C201
• C277
• Daytime running lamps
• Daytime running lamps relay
• Dome lamp
• E16
• Ecm-bat fuse 10a
• Fan relay
• From panel dimmer switch assembly (interior lights system)
• Fuel pump oil pressure switch
• Fuel pump relay
• Fuse block
• Fusible
• Fusible link
• Gages fuse 20a
• Generator
• Hazard flasher
• Headlight switch assembly
• Horn relay
• Horn/dm fuse
• Htr fuse 25a
• I/p cluster
• Ignition switch
• Instr-lps fuse 5a
• Instrument cluster
• Link
• Lock
• Lps bus
• Module
• Off
• Park brake warning switch
• Pnk
• Powertrain control module (pcm)
• Pwr circuit breaker 30a
• Red
• Relay
• Rst 10ga
• Rst 14ga
• Rst 16ga
• Rst 18ga
• Run
• Shunt
• Start
• Starter motor
• Stop-hz fuse 15a
• Stoplamp switch
• Tail lps fuse 20a
• To alt, ecm-crank, turn-b/u, trans & injector fuses and ignition coil
• Transmission position indicator lamp
• Wiper fuse 25a
• Wiper switch

Power Distribution Wiring Diagram, Motorhome Chassis (2 of 2) for GMC Forward Control P1994 3500

List of elements for Power Distribution Wiring Diagram, Motorhome Chassis (2 of 2) for GMC Forward Control P1994 3500:

• Alt fuse 20a
• Audio alarm module
• Backup lamp switch
• Cruise control brake switch
• Cruise control module
• Cruise control switch
• E15
• Ecm-crank fuse 10a
• Evaporative emissions canister purge solenoid
• F15
• Fuse block
• Generator
• Idle speed control actuator
• Ignition coil
• Ignition switch
• Inj fuse 7.5a
• Injector #1
• Injector #2
• Instrument cluster printed circuit
• Linear egr solenoid valve
• Pnk
• Powertrain control module (pcm)
• Red
• Tcc/ stoplamp switch
• Trans fuse 10a
• Transmission
• Turn signal flasher
• Turn-b/u fuse 15a
• Vehicle speed sensor buffer

POWER DOOR LOCKS

Power Door Lock Wiring Diagram for GMC Forward Control P1994 3500

List of elements for Power Door Lock Wiring Diagram for GMC Forward Control P1994 3500:

• Bus bar ground (near fuse block)
• Door lock relay (behind left side of i/p)
• Fuse block
• Hot at all times
• Left door lock motor
• Left door lock switch
• Lock
• Pwr acc circuit breaker 30a
• Right door lock motor
• Right door lock switch
• Tan
• Unlock

POWER WINDOWS

Power Window Wiring Diagram for GMC Forward Control P1994 3500

List of elements for Power Window Wiring Diagram for GMC Forward Control P1994 3500:

• 1994 vftc c
• Fuse block
• G202 (at bus bar ground
• Hot in run
• Left front switch
• Left front window motor
• Left power window master switch
• Pnk
• Pnk a
• Pwr wdo circuit breaker 30a
• Right front switch
• Right front window motor
• Right front window switch
• Tan

SHIFT INTERLOCKS

Shift Interlock Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500

List of elements for Shift Interlock Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500:

• (closed in park) (on steering
• Backup lamp switch
• Brake shift interlock relay (on steering column)
• Brake/transmission shift interlock solenoid (on steering column)
• Column)
• E13
• Fuse block
• G200 (at bus bar ground)
• Hot in acc or run
• Hot in start or run
• Powertrain contol module (left side of vehicle, behind shipping panel)
• Tcc/ brake switch (on brake pedal support bracket)
• Trans fuse 10a
• Turn b/u fuse 15a

Shift Interlock Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500

List of elements for Shift Interlock Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500:

• (closed in park) (on steering
• Backup lamp switch
• Brake shift interlock relay (on steering column)
• Brake/transmission shift interlock solenoid (on steering column)
• Column)
• E13
• Fuse block
• G200 (at bus bar ground)
• Hot in acc or run
• Hot in start or run
• Powertrain control module (left side of vehicle, behind shipping panel)
• Tcc/ brake switch (on brake pedal support bracket)
• Trans fuse 10a
• Turn b/u fuse 15a
• Turn signal flasher (on fuse block)

Shift Interlock Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500

List of elements for Shift Interlock Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500:

• (closed in park) (on steering
• Backup lamp switch
• Brake shift interlock relay (on steering column)
• Brake/transmission shift interlock solenoid (on steering column)
• Column)
• E13
• Fuse block
• G200 (at bus bar ground)
• Hot in acc or run
• Hot in start or run
• Powertrain control module (left side of vehicle, behind shipping panel)
• Tcc/ brake switch (on brake pedal support bracket)
• Trans fuse 10a
• Turn b/u fuse 15a
• Turn signal flasher (on fuse block)

STARTING/CHARGING

Charging Wiring Diagram, Commercial Chassis (Diesel) for GMC Forward Control P1994 3500

List of elements for Charging Wiring Diagram, Commercial Chassis (Diesel) for GMC Forward Control P1994 3500:

• (closes with low or high voltage; gen fault)
• (in i/p harness)
• (left side of shipping panel)
• (not
• (not used)
• (right front cylinder head)
• (right side of radiator support)
• Alt fuse 20a
• Bat
• Battery
• Battery junction block
• C205
• Field (rotor)
• Fuse block
• G109
• G119
• G201
• Generator (right front of engine)
• Hot in run, bulb test or start
• Instrument cluster
• Power distribution
• Rectifier bridge
• Red
• Regulator solid-state
• Stator
• Sw bat
• Turn on input
• Used)
• Volt sense input
• Volt- meter

Charging Wiring Diagram, Commercial Chassis (Gasoline) for GMC Forward Control P1994 3500

List of elements for Charging Wiring Diagram, Commercial Chassis (Gasoline) for GMC Forward Control P1994 3500:

• (at generator bracket) g114 (on right frame rail rear of engine (school bus ground)
• (closes with low or high voltage; gen fault)
• (in i/p harness)
• (left side of shipping panel)
• (not
• (not used)
• (rear of cylinder head) (school bus ground)
• (right side of radiator support)
• Alt fuse 20a
• Bat
• Battery
• Battery junction block
• C205
• Field (rotor)
• Fuse block
• G101
• G109
• G115
• G201
• Generator (right front of engine)
• Hot in run, bulb test or start
• Instrument cluster
• Power distribution
• Rectifier bridge
• Red
• Regulator solid-state
• Stator
• Sw bat
• Turn on input
• Used)
• Volt sense input
• Volt- meter

Charging Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500

List of elements for Charging Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500:

• (at bus bar ground)
• (closes with low or high voltage; gen fault)
• (engine compartment, behind battery
• (left lower
• (left side of shipping panel)
• (not
• (not used)
• Bat
• Battery
• Battery junction block
• C17
• Engine)
• Field (rotor)
• Front of
• Fuse block
• Fusible link (10 ga-rust)
• G110
• G111
• G202
• Gages fuse 20a
• Generator (right front of engine)
• Hot in run or start
• Instrument cluster
• Rectifier bridge
• Red
• Regulator solid-state
• Starter circuit
• Stator
• Sw bat
• Turn on input
• Used)
• Volt sense input
• Volt- meter

Charging Wiring Diagram, Motor Home Chassis for GMC Forward Control P1994 3500

List of elements for Charging Wiring Diagram, Motor Home Chassis for GMC Forward Control P1994 3500:

• (at left shipping panel)
• (closes with low or high voltage; gen fault)
• (left side of shipping panel)
• (not
• (not used)
• Aalt fuse 20a
• Bat
• Battery
• Battery junction block
• Field (rotor)
• Fuse block
• G111 (engine compartment behind battery
• Generator (right front of engine)
• Hot in run or start
• Instrument cluster
• Rectifier bridge
• Red
• Regulator solid-state
• Starter circuit
• Stator
• Sw bat
• Turn on input
• Used)
• Volt sense input
• Volt- meter

Starting Wiring Diagram, Commercial Chassis (Diesel) for GMC Forward Control P1994 3500

List of elements for Starting Wiring Diagram, Commercial Chassis (Diesel) for GMC Forward Control P1994 3500:

• (at generator bracket) g114
• (lower right side of engine)
• (on clutch pedal
• (on right frame rail rear of engine) (school bus ground)
• (right side of radiator support)
• A/t
• Accy
• Bat
• Battery
• Battery junction block (left side of
• Bulb test
• C298
• C299
• Clutch start switch
• Fusible link (20 ga. rust)
• Fusible link c (16 ga. rust)
• Fusible link e (20 ga. rust)
• G100
• G101
• G115 (rear of cylinder head) (school bus
• G125 (front of engine)
• Generator (front of engine)
• Glow plug controller (top rear of engine)
• Ground)
• Hold-in winding
• Ignition switch
• Lock
• M/t
• Off
• Pull-in winding
• Red
• Run
• Shipping panel)
• Solenoid contacts
• Start
• Starter motor
• Starter relay (lower left side of engine)
• Starter solenoid
• Support bracket)

Starting Wiring Diagram, Commercial Chassis (Gasoline) for GMC Forward Control P1994 3500

List of elements for Starting Wiring Diagram, Commercial Chassis (Gasoline) for GMC Forward Control P1994 3500:

• (at generator bracket) g114
• (lower right side of engine)
• (on clutch pedal
• (on right frame rail rear of engine) (school bus ground)
• (right side of radiator support)
• A/t
• Accy
• Bat
• Battery
• Battery junction block (left side of
• Bulb test
• C298
• C299
• Clutch start switch
• Fusible link b (14 ga. rust)
• Fusible link e (20 ga. rust)
• G100
• G101
• G115 (rear of cylinder head) (school bus
• Generator (front of engine)
• Ground)
• Hold-in winding
• Ignition switch
• Lock
• M/t
• Off
• Power distribution (fuse block)
• Pull-in winding
• Red
• Run
• Shipping panel)
• Solenoid contacts
• Start
• Starter motor
• Starter solenoid
• Support bracket)

Starting Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500

List of elements for Starting Wiring Diagram, Cutaway Chassis for GMC Forward Control P1994 3500:

• (left lower front of engine)
• (lower right side of engine)
• Accy
• Battery
• Battery junction block (left side of
• Bulb test
• C214
• C215
• Distribution
• Fusible link (16 ga rust)
• G110
• G111 (engine compartment behind battery)
• Hold-in winding
• Ignition switch
• Lock
• Off
• Power red
• Pull-in winding
• Red
• Run
• Solenoid contacts
• Start
• Starter motor
• Starter solenoid

Starting Wiring Diagram, Motor Home Chassis for GMC Forward Control P1994 3500

List of elements for Starting Wiring Diagram, Motor Home Chassis for GMC Forward Control P1994 3500:

• (lower right side of engine)
• (right frame rail near battery)
• Accy
• Bat
• Battery
• Battery junction block (left side of
• Bulb test
• C201
• C277
• Fusible link b (14 ga. rust)
• Fusible link e (20 ga. rust)
• G105
• Generator (front of engine)
• Hold-in winding
• Ignition switch
• Lock
• Off
• Pull-in winding
• Red
• Run
• Solenoid contacts
• Start
• Starter motor
• Starter solenoid

TRANSMISSION

4.3L

4.3L (VIN Z), Transmission Wiring Diagram, 4L80-E for GMC Forward Control P1994 3500

List of elements for 4.3L (VIN Z), Transmission Wiring Diagram, 4L80-E for GMC Forward Control P1994 3500:

• (behind left side of shipping panel) data link connector
• 1-2 shift sol
• 1-2 shift sol ctrl
• 2-3 shift sol
• 2-3 shift sol ctrl
• A14
• A15
• All times
• Battery
• Brake signal
• C11
• C12
• C13
• C250
• C251
• Diagnostic test
• E11
• E13
• E15
• E16
• Ecm bat fuse 10a
• Ecm-crnk fuse 10a
• Ect signal
• Electronic 4-speed automatic overdrive transmission
• Engine coolant temp sens (top right side of eng)
• F10
• F12
• F13
• F14
• F15
• Fuse block
• G125 (front of engine)
• Ground
• Hot at
• Hot in run, bulb test or start
• Ignition
• Pcs hi
• Pcs lo
• Pnk
• Powertrain control module (left side of shipping panel)
• Pressure control solenoid
• Range mode selector
• Range signal a
• Range signal b
• Range signal c
• Red
• Sensor ground
• Serial data
• Tcc sol
• Tcc sol ctrl
• Tcc/brake switch (on brake pedal support arm)
• Tft signal
• Throttle position sensor (top right side of eng)
• Tp reference
• Tp signal
• Trans fuse 10a
• Trans output speed
• Trans speed sens input
• Trans- mission input speed sensor (left frnt of trans)
• Trans- mission temp
• Vehicle speed sensor (rear of transmission)
• Vehicle speed sensor buffer (behind right side of i/p)
• Vss signal

5.7L

5.7L (VIN K), Transmission Wiring Diagram, 4L80-E for GMC Forward Control P1994 3500

List of elements for 5.7L (VIN K), Transmission Wiring Diagram, 4L80-E for GMC Forward Control P1994 3500:

• (behind left side of shipping panel) data link connector
• 1-2 shift sol
• 1-2 shift sol ctrl
• 2-3 shift sol
• 2-3 shift sol ctrl
• A14
• A15
• All times
• Battery
• Brake signal
• C11
• C12
• C13
• C250
• C251
• Diagnostic test
• E11
• E13
• E15
• E16
• Ecm bat fuse 10a
• Ecm-crnk fuse 10a
• Ect signal
• Electronic 4-speed automatic overdrive transmission
• Engine coolant temp sens (top right side of eng)
• F10
• F12
• F13
• F14
• F15
• Fuse block
• G125 (front of engine)
• Ground
• Hot at
• Hot in run, bulb test or start
• Ignition
• Pcs hi
• Pcs lo
• Pnk
• Powertrain control module (left side of shipping panel)
• Pressure control solenoid
• Range mode selector
• Range signal a
• Range signal b
• Range signal c
• Red
• Sensor ground
• Serial data
• Tcc sol
• Tcc sol ctrl
• Tcc/brake switch (on brake pedal support arm)
• Tft signal
• Throttle position sensor (top right side of eng)
• Tp reference
• Tp signal
• Trans fuse 10a
• Trans output speed
• Trans speed sens input
• Trans- mission input speed sensor (left frnt of trans)
• Trans- mission temp
• Vehicle speed sensor (rear of transmission)
• Vehicle speed sensor buffer (behind right side of i/p)
• Vss signal

6.5L

6.5L (VIN F), Transmission Wiring Diagram, 4L80-E for GMC Forward Control P1994 3500

List of elements for 6.5L (VIN F), Transmission Wiring Diagram, 4L80-E for GMC Forward Control P1994 3500:

• (tft)
• (under right end of i/p)
• 1-2 shift sol
• 1-2 shift sol ctrl
• 2-3 shift sol
• 2-3 shift sol ctrl
• 4 wheel drive low sig
• A12
• Accelerator pedal position (app) module (top of acce- lerator bracket)
• Alt fuse 20a
• App #1
• App #1 sensor 5v ref
• App #1 sensor ground
• App #1 sensor sig
• App #2
• App #2 sensor 5v ref
• App #2 sensor sig
• App #3
• App #3 sensor 5v ref
• App #3 sensor ground
• App #3 sensor sig
• B10
• Battery feed
• Bracket)
• C11
• C12
• C13
• C14
• C15
• D11
• Data link connector (below left side of i/p)
• Diagnostic request
• E10
• E11
• E13
• Ecm-bat fuse 10a
• Ecm-crank fuse 10a
• Ect sig
• Electronic 4-speed automatic overdrive transmission
• Engine coolant temperature (ect) sensor (right side of engine)
• Fuse block
• G117 (right rear of engine)
• Hot at all times
• Hot in run, bulb
• Hot in start or run
• Ignition feed
• Pnk
• Powertrain control module
• Pressure control solenoid
• Pressure ctrl sol hi
• Pressure ctrl sol lo
• Range mode selector
• Range signal "a"
• Range signal "b"
• Range signal "c"
• Red
• Sensor
• Sensor ground
• Serial data
• Speed sensor (left rear side of transmission)
• System ground
• Tan
• Tan d
• Tcc sol
• Tcc sol ctrl
• Tcc/ brake switch (on brake pedal support
• Tcc/brake sw
• Test or start
• Trans fluid temp
• Trans fluid temp sig
• Trans fuse 10a
• Trans output spd sig
• Transfer case switch
• Vehicle speed sensor buffer module (under right end of i/p)
• Vehicle speed sig

6.5L (VIN Y), Transmission Wiring Diagram, 4L80-E for GMC Forward Control P1994 3500

List of elements for 6.5L (VIN Y), Transmission Wiring Diagram, 4L80-E for GMC Forward Control P1994 3500:

• 1-2 shift sol
• 1-2 shift sol ctrl
• 2-3 shift sol
• 2-3 shift sol ctrl
• 5 volts ref
• A10
• A11
• A12
• Alt fuse 20a
• B10
• B11
• B12
• Baro press sens
• Barometric pressure (1993 only) (left side of shipping panel)
• Battery feed
• Brake signal
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• C205
• C276
• C277
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link conn (under left side of i/p)
• Diagnostic test
• Ecm bat fuse 10a
• Ecm-crnk fuse 10a
• Electronic 4-speed automatic overdrive transmission
• Engine speed sensor (center rear top of engine)
• Engine speed signal
• Fuse block
• G125
• Hot at all times
• Hot in run bulb test or start
• Ignition
• Input speed sens hi
• Input speed sens lo
• Instrument cluster
• Pcs hi
• Pcs lo
• Pnk
• Pnk d
• Pressure control solenoid
• Range mode selector
• Range signal a
• Range signal b
• Range signal c
• Red
• Red f
• Sensor
• Sensor ground
• Serial data
• Service trans output
• Service transmission indicator
• System ground
• Tcc control
• Tcc sol
• Tcc/brake switch (below left side of i/p, above brake pedal)
• Throttle position sensor (right side of throttle body)
• Tp sensor input
• Trans fluid temp sig
• Trans fuse 10a
• Trans- mission temp
• Transmission control module (tcm) (right side of i/p)
• Transmission input speed sensor (left front side of transmission)
• Vehicle spd output
• Vehicle speed input
• Vehicle speed sensor (rear of transmission)
• Vehicle speed sensor buffer (under right side of i/p)
• Vss inputs

7.4L

7.4L (VIN N), Transmission Wiring Diagram, 4L80-E for GMC Forward Control P1994 3500

List of elements for 7.4L (VIN N), Transmission Wiring Diagram, 4L80-E for GMC Forward Control P1994 3500:

• (behind left side of shipping panel) data link connector
• 1-2 shift sol
• 1-2 shift sol ctrl
• 2-3 shift sol
• 2-3 shift sol ctrl
• A14
• A15
• All times
• Battery
• Brake signal
• C11
• C12
• C13
• C250
• C251
• Diagnostic test
• E11
• E13
• E15
• E16
• Ecm bat fuse 10a
• Ecm-crnk fuse 10a
• Ect signal
• Electronic 4-speed automatic overdrive transmission
• Engine coolant temp sens (top right side of eng)
• F10
• F12
• F13
• F14
• F15
• Fuse block
• G125 (front of engine)
• Ground
• Hot at
• Hot in run, bulb test or start
• Ignition
• Pcs hi
• Pcs lo
• Pnk
• Powertrain control module (left side of shipping panel)
• Pressure control solenoid
• Range mode selector
• Range signal a
• Range signal b
• Range signal c
• Red
• Sensor ground
• Serial data
• Tcc sol
• Tcc sol ctrl
• Tcc/brake switch (on brake pedal support arm)
• Tft signal
• Throttle position sensor (top right side of eng)
• Tp reference
• Tp signal
• Trans fuse 10a
• Trans output speed
• Trans speed sens input
• Trans- mission input speed sensor (left frnt of trans)
• Trans- mission temp
• Vehicle speed sensor (rear of transmission)
• Vehicle speed sensor buffer (behind right side of i/p)
• Vss signal

WARNING SYSTEMS

Warning System Wiring Diagrams, Commercial Chassis for GMC Forward Control P1994 3500

List of elements for Warning System Wiring Diagrams, Commercial Chassis for GMC Forward Control P1994 3500:

• (in i/p harness)
• Alt fuse 20a
• Audio alarm module (below fuse block)
• Fasten belts indicator
• Fasten belts output
• Fuse block
• Ground
• Hot in run or start
• Ignition on input
• Instrument cluster

Warning System Wiring Diagrams, Cutaway Chassis for GMC Forward Control P1994 3500

List of elements for Warning System Wiring Diagrams, Cutaway Chassis for GMC Forward Control P1994 3500:

• Audio alarm module (below fuse block)
• C16
• C17
• Fasten belts indicator
• Fasten belts output
• Fuse block
• G202 (at bus bar ground)
• Gages fuse 20a
• Ground
• Hot at all times
• Hot in run or start
• Hot with headlight switch in park or head
• Ignition on input
• Inst lps fuse 5a
• Instrument cluster
• Key-in warning
• Key-in warning buzzer switch (in left side of steering column)
• Left door jamb switch
• Lights on input
• Power input
• Safety belt input
• Safety belt retractor switch (in driver's safety belt buckle)
• Stop-hz fuse 20a
• Tan

Warning System Wiring Diagrams, Motorhome Chassis for GMC Forward Control P1994 3500

List of elements for Warning System Wiring Diagrams, Motorhome Chassis for GMC Forward Control P1994 3500:

• (at left shipping panel)
• Audio alarm module (below fuse block)
• Fasten belts indicator
• Fasten belts output
• Fuse block
• Gauges fuse 20a
• Ground
• Horn/dm fuse 15a
• Hot at all times
• Hot in run or start
• Hot with headlight switch in park or head
• Ignition on input
• Instr-lps fuse 5a
• Instrument cluster
• Key-in warning
• Lights on input
• Power input
• Safety belt input

WIPER/WASHER

Front Washer/Wiper Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500

List of elements for Front Washer/Wiper Wiring Diagram, Commercial Chassis for GMC Forward Control P1994 3500:

• Control area
• Delay/ speed/ wash control
• Fuse block
• Fusible link
• Hot in accy or run
• I/p ground (in i/p harness)
• Ign
• Low
• Mist
• Off
• Park switch
• Pnk
• Pulse
• Wash pulse switch
• Windshield washer pump
• Windshield wiper motor module
• Windshield wiper/ washer switch
• Wiper fuse 25a

Front Washer/Wiper Wiring Diagram, Cutaway for GMC Forward Control P1994 3500

List of elements for Front Washer/Wiper Wiring Diagram, Cutaway for GMC Forward Control P1994 3500:

• Control area
• Delay/ speed/ wash control
• Fuse block
• Fusible link
• G202 (left side of i/p)
• Hot in accy or run
• Ign
• Low
• Mist
• Off
• Park switch
• Pnk
• Pulse
• Wash pulse switch
• Windshield washer pump (left kick panel)
• Windshield wiper motor module (center of i/p)
• Windshield wiper/ washer switch
• Wiper fuse 25a

Wiper/Washer Provisions Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500

List of elements for Wiper/Washer Provisions Wiring Diagram, Motorhome Chassis for GMC Forward Control P1994 3500:

• Fuse block
• G114 (left rear of engine)
• Hot in accy or run
• Mist
• Off
• Pnk
• Provisions for wiper/washer module
• Pulse
• Pulse wiper/ washer switch
• Wash pulse
• Wiper fuse 25a
• Wiper motor connector