GMC Forward Control P3500 (1985-1999) gas diesel Wiring diagrams

1-3 FUSE 9 12 2 DATA LINK CONNECTOR (BELOW DASH, NEAR STEERING COLUMN) PPL ABS IND. BATTERY GROUND BLK (OR BLK/WHT) WIRE BLK WIRE BRAKE IND BRAKE PRESSURE DIFFERENTIAL SWITCH (INTERNAL TO ELECTRONIC BRAKE CONTROL MODULE) BRN WIRE DIESEL DIESEL: ENGINE HARN, 32 CM FROM BREAKOUT TO BATTERY JUNCTION BLOCK) DIODE NETWORK (ON I/P HARNESS, BODY BUILDER INSTALLED) DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (BELOW RADIATOR, ON LOWER CROSSMEMBER) FUSE LINK (IN BATTERY JUNCTION BLOCK, AT LEFT REAR OF ENGINE COMPT) GAS GAS DIESEL GAUGES FUSE 8 HOT AT ALL TIMES HOT IN RUN HOT IN RUN AND START I/P FUSE BLOCK (BEHIND DASH PANEL) (BODY BUILDER INSTALLED) IGNITION ABS LAMP CONTROL BRAKE SW INPUT INSTRUMENT CLUSTER LEFT FRONT WHEEL SPEED SENSOR LT BLU WIRE LT GRN WIRE NCA WIRE PNK WIRE PPL PPL PPL 1807 680 RED WIRE RIGHT FRONT WHEEL SPEED SENSOR SENSOR LOW SENSOR LOW SENSOR HIGH SENSOR HIGH 873 833 STOPLAMPS SWITCH (AT BRAKE PEDAL SUPPORT) TAN WIRE TAN/WHT WIRE VEHICLE SPEED SENSOR CALIBRATOR (LEFT SIDE OF DRIVER'S ISLAND ON RELAY BRACKET) WARNINGS SYSTEM YEL WIRE YEL/BLK WIRE

A/C COMPRESSOR CLUTCH A/C COMPRESSOR REFRIGERANT PRESSURE SWITCH A/C COMPRESSOR RELAY AUXILARY ENGINE COOLANT FAN MOTOR AUXILIARY ENGINE COOLANT FAN A/C PRESSURE SWITCH BATTERY BLK WIRE BRAIDED STRAP DATA LINK CONNECTOR DAYTIME RUNNING LAMPS CONTROL MODULE DAYTIME RUNNING LAMPS RELAY DIESEL DIFFERENTIAL BREAKOUT) ELECTRONIC BRAKE CONTROL MODULE ENGINE BLOCK) ENGINE COOLANT LEVEL SWITCH FUEL LEVEL SENSOR FUEL PUMP (DIESEL) FUEL PUMP MODULE GAS DIESEL GASOLINE GLOWPLUG RELAY (MECHANICAL) HIGH NOTE HORN STEERING COLUMN HORN BREAKOUT) I/P DIMMER SWITCH SEAT BELT ALARM MODULE I/P FUSE BLOCK BREAKOUT) JUNCTION BLOCK BREAKOUT) LEFT PARK/ TURN SIGNAL LAMP RIGHT PARK/ TURN SIGNAL LAMP LEFT SIDE MARKER LAMP LOW NOTE HORN LEFT HEADLAMP PARK BRAKE INDICATOR SWITCH RIGHT HEADLAMP RIGHT SIDE MARKER LAMP SECONDARY BATTERY (DIESEL ONLY) STARTER RELAY

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