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

A/C COMPRESSOR CLUTCH RELAY (ENGINE FIREWALL RELAY BRACKET) A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (REAR OF A/C COMPRESSOR) A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH (A/C ACCUMULATOR) A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH (ON A/C ACCUMULATOR) A/C ENABLE A/C GROUND BLK WIRE DIODE A/C COMPRESSOR CLUTCH DK GRN WIRE DK GRN/WHT WIRE ENG-BAT FUSE GAUGES FUSE GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK LT BLU WIRE ORG/ WIRE PNK WIRE VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) A/C REQUEST WHT WIRE

A/C COMPRESSOR CLUTCH RELAY (ENGINE FIREWALL RELAY BRACKET) A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (REAR OF A/C COMPRESSOR) A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH (A/C ACCUMULATOR) A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH (ON A/C ACCUMULATOR) A/C ENABLE A/C GROUND BLK WIRE DIODE A/C COMPRESSOR CLUTCH DK GRN WIRE DK GRN/WHT WIRE ENG-BAT FUSE GAUGES FUSE GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK LT BLU WIRE ORG/ WIRE PNK WIRE VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) A/C REQUEST WHT WIRE

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

A/C COMPRESSOR CONTROL RELAY (RIGHT SIDE OF DRIVER'S ISLAND) A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (IN HIGH PRESSURE LINE) A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH (REAR OF A/C COMPRESSOR) A/C ENABLE BLK WIRE BRN WIRE DIODE A/C COMPRESSOR CLUTCH DK GRN WIRE DK GRN/WHT WIRE ENG-BAT FUSE GAUGES FUSE GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN I/P FUSE BLOCK ORG/ WIRE PNK WIRE POWERTRAIN CONTROL MODULE (LEFT SIDE OF DRIVER'S ISLAND) A/C REQUEST WHT WIRE

A/C COMPRESSOR CLUTCH RELAY (ENGINE FIREWALL RELAY BRACKET) A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (REAR OF A/C COMPRESSOR) A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH (ON A/C ACCUMULATOR) BLK WIRE DIODE A/C COMPRESSOR CLUTCH DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENG-BAT FUSE GRN WIRE GRY WIRE HOT AT ALL TIMES I/P FUSE BLOCK ORG/ WIRE VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) W/ VCM W/O VCM WHT (OR WIRE WHT WIRE

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

A/C COMPRESSOR CLUTCH RELAY (RIGHT SIDE OF DRIVER'S ISLAND) A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (REAR OF COMPRESSOR) A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH (REAR OF COMPRESSOR) BLK WIRE BRN WIRE DIODE A/C COMPRESSOR CLUTCH DK GRN WIRE ENG-BAT FUSE GRN WIRE GRY WIRE HOT AT ALL TIMES I/P FUSE BOX ORG/ WIRE

A/C COMPRESSOR RELAY ACCESSORY JUNCTION BLOCK (LEFT INTERIOR BULKHEAD, NEAR RELAY BRACKET) AUXILIARY ENGINE COOLANT FAN RELAY (DIESEL ONLY) GLOW PLUG CONTROLLER (DIESEL) BATT BUS BATTERY BATTERY JUNCTION BLOCK (LEFT SIDE OF ENGINE BULKHEAD) BLK WIRE BLU WIRE DATA LINK CONNECTOR DIESEL DOME LAMP (PROVISIONS FOR) ECM-BAT FUSE 6 ELECTRONIC BRAKE CONTROL MODULE ENG BAT FUSE 10 FUEL PUMP RELAY VEHICLE CONTROL MODULE FUSIBLE LINK (10 GA-RUST) FUSIBLE LINK (12 GA- FUSIBLE LINK (14 GA- FUSIBLE LINK (16 GA- FUSIBLE LINK (18 GA- GAS GENERATOR GRY WIRE HAZARD LAMP FLASHER HEADLAMPS SWITCH HORN DM FUSE 3 HORN RELAY I/P FUSE BLOCK (DASH PANEL PROVIDED BY BODY BUILDER) ORG/ WIRE OTHERS POWERTRAIN CONTROL MODULE PWR BUS PWR CIRCUIT BREAKER RED WIRE REMOTE BATTERY ACCESS TERMINAL BLOCK (REAR OF RIGHT RADIATOR CORE SUPPORT PANEL) SEAT BELT ALARM MODULE SECONDARY BATTERY (DIESEL ONLY) STARTER RELAY STARTER SOLENOID STOP-HAZ FUSE 11 STUD TAIL LPS FUSE 7 TO IGNITION SWITCH (DIAGRAM 2 OF 4) TORQUE CONVERTER CLUTCH, STOPLAMPS SWITCH TRANSMISSION CONTROL MODULE (A/T ONLY) FUEL PUMP RELAY W/DELUXE SCHOOL BUS OPTION

1996 VFTC 6.5L ENGINE A/C COMPRESSOR RELAY A/T AUX CIRCUIT BREAKER 13 AUX FUSE BACK UP LAMPS SWITCH BRN WIRE CB CB I-3 FUSE 9 DAYTIME RUNNING LAMP RELAY INSTRUMENT CLUSTER DAYTIME RUNNING LAMPS CONTROL MODULE DIESEL DK GRN WIRE ECM 1 FUSE 12 ELECTRONIC BRAKE CONTROL MODULE FROM ENG-1 FUSE (DIAGRAM 2 OF 4) FROM IGNITION SWITCH (DIAGRAM 2 OF 4) FROM VCM BREAKOUT) FUEL INJECTION PUMP SHUT-OFF SOLENOID GAS GAUGES FUSE 8 GENERATOR GENERATOR GLOW PLUG CONTROLLER (FEDERAL) GRY WIRE HTR BUS HTR FUSE 1 I/P FUSE BLOCK (DASH PANEL PROVIDED BY BODY BUILDER) IGN BUS INSTRUMENT CLUSTER INSTRUMENT LAMPS FUSE INTERIOR LIGHTS SYSTEM (I/P LAMPS DIMMER SWITCH) M/T ORG/ WIRE OTHERS PARK/ NEUTRAL POSITION AND BACKUP LAMPS SWITCH PNK (ENGINE HARNESS, APPROX 26 CM FROM BULKHEAD GROMMET) WIRE PNK PNK PNK WIRE PNK PNK WIRE PNK WIRE POWERTRAIN CONTROL MODULE (ELEC) SEAT BELTS ALARM MODULE TORQUE CONVERTER CLUTCH, STOP LAMPS SWITCH TURN B/U FUSE 5 TURN SIGNAL FLASHER VEHICLE CONTROL MODULE (VCM) WATER IN FUEL INDICATOR SENSOR FUEL HEATER GLOW PLUG CONTROLLER (CALIF)

1996-97 1998/ 1999 92 PPL (OR 94 PNK WIRE BLK WIRE BRN WIRE BRN/WHT WIRE DELAY RHEO- STAT GRY WIRE HIGH OFF LOW OFF WASH PULSE HOT IN ACCY AND RUN I/P FUSE BLOCK LT BLU WIRE LT BLU/BLK WIRE LT GRN/BLK WIRE MIST PNK 94 WIRE PPL 92 PROVISIONS FOR WIPER/WASHER MOTOR PULSE WIPER CONTROL MODULE (STRAPPED TO HARNESS UNDER DRIVER'S ISLAND) WIPER FUSE WIPER FUSE 14 WIPER/ WASHER SWITCH YEL WIRE