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GMC Forward Control P3500 (1985-1999) blk Wiring diagrams

This page contains all the electrical diagrams for the component. blk, in which he is found in the car GMC Forward Control P3500 (1985-1999). You can view various wiring diagrams where this component is used, as well as go to more detailed diagrams to see the complete connection and interaction in the system. All diagrams have links to quickly jump to the corresponding section with the component for easy viewing..

blk wiring diagram (161 of 234)

GMC Forward Control P3500 (1985-1999) blk wiring diagram (161 of 234)

1-2 SHIFT SOL 1-2 SHIFT SOLENOID 2-3 SHIFT SOL 2-3 SHIFT SOLENOID A/T ISS HI IN A/T ISS LO IN AUTO TRANSMISSION INPUT SHAFT SPEED SENSOR (INSIDE FRONT OF TRANSMISSION) AUTOMATIC TRANSMISSION BATTERY IN BLK WIRE BLK/WHT WIRE BRAKE SWITCH INPUT BRN WIRE BRN/WHT WIRE DATA CLASS II DK BLU WIRE DK BLU/WHT WIRE ECM BATT FUSE ECM I FUSE ECT SENS INPUT ENG 1 FUSE ENGINE COOLANT TEMP SENSOR (TOP FRONT OF ENGINE) FUSE GAUGES FUSE GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START I/P FUSE BLOCK IGNITION IN INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MALFUNCTION INDICATOR LAMP MIL CONTROL ORG/ WIRE PCM GROUND PCS SOL HI OUT PCS SOL LO OUT PNK WIRE PPL PPL DATA LINK CONNECTOR PPL/WHT WIRE PRESS CTRL SOLENOID RANGE SIGNAL "A" RANGE SIGNAL "B" RANGE SIGNAL "C" RED WIRE RED/BLK WIRE SENSOR GROUND SENSOR RETURN TCC PWM SOL TCC PWM SOLENOID TCC/STOP- LAMP SWITCH (ON BRAKE PEDAL BRACKET) THROTTLE POSITION SENSOR (MOUNTED TO SIDE OF THROTTLE BODY) TP SENS INPUT TRANS FLUID TEMP SENSOR TRANS FUSE TRANS RANGE PRESSURE SWITCH ASSEMBLY TRANS TEMP SIG IN VEHICLE CONTROL MODULE (VCM) (BEHIND LEFT HEADLIGHT) VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VSS HI VSS LO YEL WIRE YEL/BLK WIRE

Go to component -> 4.3l (vin w), transmission circuit -> BLK WIRE

blk wiring diagram (162 of 234)

GMC Forward Control P3500 (1985-1999) blk wiring diagram (162 of 234)

BAT BAT (BASE) GENERATOR BATTERY BLK WIRE FUSIBLE LINK FUSIBLE LINK (10 GA-RUST) GASOLINE DIESEL GAUGES FUSE HOT IN RUN AND START I/P FUSE BLOCK INSTRUMENT CLUSTER TACH (DIESEL) PNK (COMMERCIAL) (MOTOR HOME) PNK WIRE PNK WIRE POWER DISTRIBUTION SYSTEM RED (OR GRY) WIRE RED WIRE SECONDARY BATTERY (DIESEL) STARTER SOLENOID WHT WIRE

Go to component -> Charging circuit -> BLK WIRE

blk wiring diagram (163 of 234)

GMC Forward Control P3500 (1985-1999) blk wiring diagram (163 of 234)

7.4L 7.4L 6.5L A/C COMPRESSOR CLUTCH A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH AUDIO ALARM AUXILIARY ENGINE COOLANT FAN A/C PRESSURE SWITCH AUXILIARY ENGINE COOLANT FAN MOTOR BLK WIRE BRAKE PRESSURE DIFFERENTIAL SWITCH BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID BRAKE/ TRANS- MISSION SHIFT INTERLOCK SOLENOID RELAY CRUISE CONTROL MODULE DATA LINK CONNECTOR DAYTIME RUNNING LAMPS CONTROL MODULE PULSE WIPER CONTROL MODULE DAYTIME RUNNING LAMPS RELAY ELECTRONIC BRAKE CONTROL MODULE ENGINE COOLANT FAN MOTOR ENGINE COOLANT LEVEL SWITCH FUEL LEVEL SENSOR FUEL LIFT PUMP FUEL PUMP MODULE HEADLAMPS/ PANEL DIMMER SWITCH PARK BRAKE PULL BUTTON RELAY I/P DIMMER SWITCH I/P FUSE BLOCK INLINE TO STEERING COLUMN HARNESS INSTRUMENT CLUSTER LEFT SIDE MARKER LAMP NCA WIRE PARK BRAKE ACTUATOR POSITION SWITCH PARK BRAKE ALARM RELAY PARK BRAKE PRESSURE VALVE SOLENOID PARK BRAKE PUMP RELAY PARK BRAKE PUMP MOTOR PULSE WIPER CONTROL MODULE A/C COMPRESSOR CLUTCH RIGHT SIDE MARKER LAMP TO INSTRUMENT PANEL) VECHILE CONTROL MODULE (7.4L) POWERTRAIN CONTROL MODULE (6.5L) VEHICLE SPEED SENSOR CALIBRATOR WHT WIRE

Go to component -> Ground distribution circuit, motor home chassis (2 of 2) -> BLK WIRE

blk wiring diagram (164 of 234)

GMC Forward Control P3500 (1985-1999) blk wiring diagram (164 of 234)

1996 VFTC ACCY BLK WIRE BLK/WHT WIRE BULB TEST DAYTIME RUNNING LAMPS (DRL) MODULE (ATTACHED TO I/P HARNESS AT STEERING COLUMN) DAYTIME RUNNING LAMPS (DRL) RELAY (ON MAIN SUPPORT BRACKET AT DRIVER'S ISLAND) DAYTIME RUNNING LAMPS (DRL) RELAY 2 DIODE NETWORK DK BLU WIRE DK GRN/WHT WIRE DRL INDICATOR GAUGES FUSE GRN WIRE HEAD- LAMP DIMMER SWITCH HEADLAMPS SWITCH HI BEAM INDICATOR HI LO HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK IGNITION SWITCH INSTRUMENT CLUSTER INSTRUMENT CLUSTER SYSTEM LEFT HEAD- LAMP LEFT HI BEAM HEAD- LAMP LO HI LOCK OFF LT GRN WIRE LT GRN/BLK WIRE NEAR BREAKOUT FOR CHASSIS HARNESS) ORG/ WIRE PARK BRAKE IN FOG LAMPS PARK BRAKE INDICATOR SWITCH (ON PARK BRAKE) PARK HEAD OFF PNK IGNITION LAMP FEED HI BM FEED HI BM INDICATOR DRL RELAY CTRL GROUND WIRE PNK WIRE RIGHT HEAD- LAMP RIGHT HI BEAM HEAD- LAMP RUN WIRE TAN WIRE TAN/WHT WIRE WHT WIRE YEL WIRE

Go to component -> Headlight circuit, motor home chassis with dual headlamps drl -> BLK WIRE

blk wiring diagram (165 of 234)

GMC Forward Control P3500 (1985-1999) blk wiring diagram (165 of 234)

1996 VFTC ACCY BLK WIRE BLK/WHT WIRE BULB TEST DAYTIME RUNNING LAMPS (DRL) MODULE (ATTACHED TO I/P HARNESS AT STEERING COLUMN) DAYTIME RUNNING LAMPS (DRL) RELAY (ON MAIN SUPPORT BRACKET AT DRIVER'S ISLAND) DIODE NETWORK DK BLU WIRE DK GRN/WHT WIRE DRL INDICATOR GAUGES FUSE GRN WIRE HEAD- LAMP DIMMER SWITCH HEADLAMPS SWITCH HI LO HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK IGNITION SWITCH INSTRUMENT CLUSTER INSTRUMENT CLUSTER SYSTEM HI BEAM INDICATOR LEFT HEAD- LAMP LO HI LOCK OFF LT GRN WIRE LT GRN/BLK WIRE NEAR BREAKOUT FOR CHASSIS HARNESS) ORG/ WIRE PARK BRAKE IN FOG LAMPS PARK BRAKE INDICATOR SWITCH (ON PARK BRAKE) PARK HEAD OFF PNK IGNITION LAMP FEED HI BM FEED HI BM INDICATOR DRL RELAY CTRL GROUND WIRE PNK WIRE RIGHT HEAD- LAMP RUN WIRE TAN WIRE TAN/WHT WIRE WHT WIRE YEL WIRE

Go to component -> Headlight circuit, motor home chassis with single headlamps drl -> BLK WIRE

blk wiring diagram (166 of 234)

GMC Forward Control P3500 (1985-1999) blk wiring diagram (166 of 234)

4 13 PNK WIRE A/T ABS IND. ACCY BULB TEST LOCK OFF ANTI-LOCK BRAKES SYSTEM AUTO PARK IND. BLK WIRE BLK/WHT WIRE BRAKE IND DRL IND BRN/WHT WIRE CHECK GAUGES IND COOLANT TEMPERATURE GAUGE DIESEL DK BLU WIRE DK GRN WIRE DOOR AJAR IND ECM 1 FUSE 12 ENGINE CONTROLS OR STARTING/ CHARGING SYSTEM ENGINE CONTROLS SYSTEM ENGINE CONTROLS SYSTEM ENGINE CONTROLS SYSTEM ENGINE COOLANT LEVEL SWITCH (ON LOWER LEFT END OF RADIATOR SURGE TANK) FUEL GAUGE FUEL SENDER (ON TOP OF FUEL TANK) GAS GAUGES FUSE 8 GRY WIRE GRY/BLK WIRE HEADLIGHTS SYSTEM HI-BEAM IND HOT IN RUN OR START I/P FUSE BLOCK (BEHIND DASH PANEL) (BODY BUILDER INSTALLED) IGNITION SWITCH ILLUMINATION IN-LINE CONNECTOR PROVISIONS FOR BODY BUILDER INSTRUMENT CLUSTER INTERIOR LIGHTS SYSTEM WARNING SYSTEMS LEFT TURN IND LOW COOLANT IND LT BLU WIRE LT GRN (OR WHT) WIRE LT GRN WIRE LT GRN/BLK WIRE MALFUNCTION IND. LAMP (MIL) (SERVICE ENGINE SOON IND) OIL PRESSURE GAUGE PNK WIRE PPL PPL DIESEL PPL GAS PPL RIGHT TURN IND RUN WIRE SEAT BELT IND SERVICE THROTTLE SOON IND SPEEDOMETER TACHOMETER TAN WIRE TAN/WHT WIRE VEHICLE CONTROL MODULE (ON LEFT SIDE OF RADIATOR SUPPORT) VOLTMETER VSS CALIBRATOR (LEFT SIDE OF DRIVER'S ISLAND, UNDER RELAY BRACKET) WAIT TO START IND WATER IN FUEL IND WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

Go to component -> Instrument cluster circuit, motor home chassis (1 of 2) -> BLK WIRE

blk wiring diagram (167 of 234)

GMC Forward Control P3500 (1985-1999) blk wiring diagram (167 of 234)

ACCY AUTO APPLY FUSE 19 BATTERY JUNCTION BLOCK BLK WIRE BLK/WHT WIRE BRAKE PRESSURE DIFFERENTIAL SWITCH (INTERNAL TO ELECTRONIC BRAKE CONROL MODULE) DAYTIME RUNNING LAMPS MODULE DIODE DIODE NETWORK (DASH HARN, DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (EBCM) (BELOW RADIATOR, ON LOWER CROSSMEMBER) FROM FUSE BLOCK) FUSE BLOCK FUSIBLE LINK GAS DIESEL HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK (BEHIND DASH PANEL) (BODY BUILDER INSTALLED) IGNITION SWITCH LOCK OFF LT BLU WIRE LT GRN WIRE NCA WIRE ORG/ WIRE PARK BRAKE ACTUATOR POSITION SWITCH PARK BRAKE ALARM PARK BRAKE ALARM RELAY (ON I/P HARNESS) (BODY BUILDER INSTALLED) PARK BRAKE PULL BUTTON RELAY (ON I/P HARNESS) (BODY BUILDER INSTALLED) PARK/NEUTRAL POSITION SWITCH RELAY (ON RIGHT SIDE OF DRIVER'S ISLAND) PNK PNK WIRE PNK WIRE PNK/BLK WIRE PPL RED WIRE RUN WIRE SHIFT INTERLOCK SYSTEM TAN/WHT WIRE W/ DRL W/ DRL W/O DRL PARK BRAKE INDICATOR SWITCH (BODY BUILDER INSTALLED) W/O DRL WHT WIRE YEL WIRE YEL/BLK WIRE

Go to component -> Instrument cluster circuit, motor home chassis (2 of 2) -> BLK WIRE

blk wiring diagram (168 of 234)

GMC Forward Control P3500 (1985-1999) blk wiring diagram (168 of 234)

1996 VFTC A/C COMPRESSOR CLUTCH RELAY AUXILIARY ENGINE COOLANT FAN RELAY (DIESEL ONLY) BATT BUS BATTERY BATTERY JUNCTION BLOCK (LEFT SIDE OF ENGINE BULKHEAD, ABOVE RELAY BRACKET) BLK WIRE DATA LINK CONNECTOR (DLC) DIESEL DOME LAMP (PROVISIONS FOR) ECM BAT FUSE ENG-BAT FUSE FUEL PUMP RELAY FUEL PUMP SWITCH, ENGINE OIL PRESSURE GAUGE SENSOR FUSIBLE LINK (10 GA-RUST) FUSIBLE LINK (16 GA- FUSIBLE LINK 12 GA. BLUE FUSIBLE LINK 18 GA. BLUE FUSIBLE LINK 18 GA. RUST GAS GENERATOR (RIGHT FRONT OF ENGINE) GLOW PLUG CONTROL SWITCH (DIESEL ONLY) GRY WIRE HAZARD WARNING LAMPS FLASHER HEADLAMPS SWITCH HORN RELAY HORN/ DM FUSE TAIL LPS FUSE I/P FUSE BLOCK (DASH PANEL PROVIDED BY BODY BUILDER) (BODY BUILDER INSTALLED) IGNITION SWITCH ORG/ WIRE PWR BUS PWR FUSE RED WIRE REMOTE BATTERY ACCESS TERMINAL BLOCK (REAR OF RIGHT RADIATOR CORE SUPPORT PANEL) SEAT BELT ALARM SECONDARY BATTERY (DIESEL ONLY) STARTER RELAY STARTER SOLENOID (AT STARTER, LOWER RIGHT SIDE OF ENGINE) STOP/ HAZ FUSE STUD TO HEADLAMPS SWITCH (CAVITY E) TORQUE CONVERTER CLUTCH, STOPLAMPS SWITCH TRANSMISSION CONTROL MODULE (A/T ONLY) VEHICLE CONTROL MODULE (VCM) W/DELUXE SCHOOL BUS

Go to component -> Power distribution circuit, commercial chassis (1 of 5) -> BLK WIRE

blk wiring diagram (169 of 234)

GMC Forward Control P3500 (1985-1999) blk wiring diagram (169 of 234)

1996 VFTC 6.5L VIN F 6.5L VIN F 7.4L VIN J 7.4L VIN J (L29), 6.5L VIN F (L65) ENGINES ONLY 7.4L VIN N A/C COMPRESSOR CONTROL RELAY BATTERY BATTERY JUNCTION BLOCK (ON FORWARD LEFT SIDE OF THE BULKHEAD) BLANK FUSE BLK WIRE BUSS BAR DATA LINK CONNECTOR (DLC) DIESEL ONLY DOME LAMP ENG-BAT FUSE FAN CONTROL RELAY FUEL PUMP RELAY FUSIBLE LINK (10 GA-RUST) FUSIBLE LINK (14 GA- FUSIBLE LINK (16 GA- FUSIBLE LINK 12 GA. BLUE FUSIBLE LINK 18 GA. BLUE GENERATOR (ON RIGHT FRONT OF ENGINE) GLOW PLUG CONTROL RELAY HAZARD LAMPS FLASHER HEADLAMPS SWITCH HORN RELAY HORN- DM FUSE I/P FUSE BLOCK (MOUNTED ON THE I/P) IGNITION SWITCH ONLY ORG/ WIRE POWERTRAIN CONTROL MODULE (PCM) POWERTRAIN CONTROL MODULE (PCM) VEHICLE CONTROL MODULE (VCM) PWR CIRCUIT BREAKER RED WIRE SEAT BELTS/ LAMPS ALARM MODULE SECONDARY BATTERY (DIESEL ONLY) STARTER MOTOR (ON RIGHT REAR SIDE OF ENGINE) STARTER RELAY STOP- HAZ FUSE ECM- BAT FUSE TAIL LAMPS FUSE TO HEADLAMPS SWITCH (CAVITY E) TORQUE CONVERTER CLUTCH (TCC), STOPLAMPS SWITCH

Go to component -> Power distribution circuit, motor home chassis (1 of 5) -> BLK WIRE

blk wiring diagram (170 of 234)

GMC Forward Control P3500 (1985-1999) blk wiring diagram (170 of 234)

A/T ACCY BATTERY BATTERY JUNCTION BLOCK BLK WIRE CLUTCH PEDAL POSITION SWITCH (TOP OF CLUTCH PEDAL SUPPORT) DIESEL ONLY DK BLU WIRE DK BLU/WHT WIRE ENGINE CONTROLS SYSTEM (COMMERCIAL DIESEL ONLY) FUSIBLE LINK FUSIBLE LINK (10 GA-RUST) IGNITION SWITCH IN LINE CRANK FUSE 18 (COMMERCIAL) OR I/P FUSE BLOCK, CRANK FUSE 18 (MOTOR HOME) LOCK M/T OFF PARK/NEUTRAL POSITION AND BACKUP LAMPS SWITCH (LEFT SIDE OF TRANSMISSION) PPL PPL M/T PULL- IN COIL HOLD- IN COIL RED WIRE RUN WIRE SECONDARY BATTERY (DIESEL) STARTER MOTOR STARTER SOLENOID WHT WIRE YEL WIRE

Go to component -> Starting circuit -> BLK WIRE

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