GMC Rally G3500 (1985-1996) red Wiring diagrams

ABS IND. ABS MAXI FUSE 4 BLK WIRE BLK/ WHT WIRE BLK/WHT WIRE BRAKE FUSE 18 BRAKE IND BRAKE PRESSURE WARNING SWITCH BRAKE SW OUTPUT BRAKE/ BRN WIRE DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (LEFT FRONT SIDE OF FRAME) HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN OR START GAUGES FUSE 4 I/P FUSE BLOCK IGN ABS LAMP CONTROL BRAKE SW INPUT INLINE DIODE INSTRUMENT CLUSTER LEFT FRONT WHEEL SPEED SENSOR LFT FRT SENSOR (-) LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE PARK BRAKE WARNING SWITCH PNK WIRE PPL PPL/WHT WIRE PUMP MOTOR POWER PUMP MOTOR GROUND RED WIRE RIGHT FRONT WHEEL SPEED SENSOR RT FRT SENSOR (-) LFT FRT SENSOR (+) RT FRT SENSOR (+) TAN WIRE TAN/WHT WIRE TCC/ STOPLAMP SWITCH (ABOVE BRAKE PEDAL) UNDERHOOD FUSE-RELAY CENTER VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT SIDE OF TRANSMISSION) VEHICLE SPEED SIG VSS VSS SIG SERIAL DATA LINE SERIAL DATA SIGNAL BRAKE LAMP CONTROL EBCM GROUND W/O DRL W/DRL WHT TAN/ WIRE WHT WIRE YEL WIRE

ABS IND. ABS MAXI FUSE 4 BLK WIRE BLK/WHT WIRE BRAKE FUSE 18 BRAKE IND BRAKE PRESSURE WARNING SWITCH BRAKE/ BRN WIRE DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (LEFT FRONT SIDE OF FRAME) HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN OR START GAUGES FUSE 4 I/P FUSE BLOCK IGN ABS LAMP CONTROL BRAKE SW INPUT INLINE DIODE INSTRUMENT CLUSTER LFT FRT SENSOR (-) LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE PARK BRAKE WARNING SWITCH PNK WIRE PPL PPL/WHT WIRE PUMP MOTOR POWER PUMP MOTOR GROUND RED WIRE RIGHT FRONT WHEEL SPEED SENSOR RT FRT SENSOR (-) LFT FRT SENSOR (+) RT FRT SENSOR (+) TAN WIRE TAN/WHT WIRE TCC/ STOPLAMP SWITCH (ABOVE BRAKE PEDAL) UNDERHOOD FUSE-RELAY CENTER VEHICLE SPEED SENSOR (LEFT SIDE OF TRANSMISSION) LEFT FRONT WHEEL SPEED SENSOR VSS VSS SIG SERIAL DATA LINE SERIAL DATA SIGNAL BRAKE LAMP CONTROL EBCM GROUND W/O DRL W/DRL WHT TAN/ WIRE WHT WIRE YEL WIRE

ABS IND. ABS MAXI FUSE 4 BLK WIRE BLK/ WHT WIRE BLK/WHT WIRE BRAKE FUSE 18 BRAKE IND BRAKE PRESSURE WARNING SWITCH BRAKE SW OUTPUT BRAKE/ BRN WIRE DK GRN WIRE ELECTRONIC BRAKE CONTROL MODULE (LEFT FRONT SIDE OF FRAME) HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN OR START GAUGES FUSE 4 I/P FUSE BLOCK IGN ABS LAMP CONTROL BRAKE SW INPUT INLINE DIODE INSTRUMENT CLUSTER LEFT FRONT WHEEL SPEED SENSOR LFT FRT SENSOR (-) LT BLU WIRE LT GRN WIRE LT GRN/BLK WIRE PARK BRAKE WARNING SWITCH PNK WIRE PPL PPL/WHT WIRE PUMP MOTOR POWER PUMP MOTOR GROUND RED WIRE RIGHT FRONT WHEEL SPEED SENSOR RT FRT SENSOR (-) LFT FRT SENSOR (+) RT FRT SENSOR (+) TAN WIRE TAN/WHT WIRE TCC/ STOPLAMP SWITCH (ABOVE BRAKE PEDAL) UNDERHOOD FUSE-RELAY CENTER VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT SIDE OF TRANSMISSION) VEHICLE SPEED SIG VSS VSS SIG SERIAL DATA LINE SERIAL DATA SIGNAL BRAKE LAMP CONTROL EBCM GROUND W/O DRL W/DRL WHT TAN/ WIRE WHT WIRE YEL WIRE

1-2 SHIFT SOL 2-3 SHIFT SOL ALT FUSE BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BRN WIRE BRN/WHT WIRE DATA LINK CONNECTOR (BELOW LEFT SIDE OF DASH) DK BLU WIRE DK BLU/WHT WIRE ECM BAT FUSE ECM-CRNK FUSE ENGINE COOLANT TEMPERATURE (ECT) SENSOR (TOP FRONT OF ENGINE) GRY WIRE GRY/RED WIRE HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK INSTRUMENT CLUSTER LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE ORG/ WIRE ORG/BLK WIRE PNK WIRE PNK/BLK WIRE POWERTRAIN CONTROL MODULE (PCM) (LEFT SIDE OF DRIVER'S ISLAND) PPL PPL PNK WIRE PRESSURE CONTROL SOLENOID RANGE MODE SELECTOR RED WIRE RED/BLK WIRE SERVICE ENGINE SOON SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) TAN WIRE TCC PWM SOL TCC/BRAKE SWITCH (ON BRAKE PEDAL BRACKET) THROTTLE POSITION SENSOR (RIGHT SIDE OF TBI) TRANS FLUID TEMP (TFT) SENSOR TRANS FUSE TRANSMISSION TRANSMISSION INPUT SHAFT SPEED SENSOR (FRONT OF TRANSMISSION) VEHICLE SPEED SENSOR BUFFER WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

A/C BI-LEV A/C COMPRESSOR CLUTCH COIL A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE/RELAY CENTER) A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (REAR OF A/C COMPRESSOR) A/C COMPRESSOR LOW PRESSURE CUTOFF SWITCH (IN REFRIGERANT LINE) AUXILIARY BLOWER MOTOR AUXILIARY BLOWER MOTOR RESISTOR (LEFT REAR OF CABIN, BEHIND REAR WHEELHOUSE) BLK WIRE BLOWER MOTOR BLOWER MOTOR RESISTOR/RELAY (AT HVAC CONTROL PANEL) BRN WIRE COMPT AT LEFT FENDER) POWERTRAIN CONTROL MODULE (BEHIND (DIESEL) CENTER OF I/P) CONVENIENCE CENTER DIODE (IN UNDERHOOD FUSE/RELAY CENTER) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE EXCEPT 7.4L PNK WIRE FUSE 12 FUSE 24 GASOLINE GASOLINE DIESEL GRN WIRE GRY WIRE HEATER AND A/C CONTROLLER HOT AT ALL TIMES HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN HOT IN RUN OR START HVAC FUSE I/P FUSE BLOCK LT BLU WIRE LT GRN WIRE OFF LO MED HI OFF MAX ORG/ WIRE PNK PNK 7.4L UNDER- HOOD FUSE/ RELAY CENTER WIRE PNK WIRE PPL REAR AUXILIARY HVAC CONTROL MODULE RED WIRE TAN WIRE TEMP UNDER- HOOD FUSE/ RELAY CENTER A/C FUSE IGN E FUSE UNDERHOOD FUSE/RELAY CENTER RR HVAC FUSE VEHICLE CONTROL MODULE (IN ENGINE VENT HEAT BLEND DEF VENT HEAT BLEND DEF OFF MAX A/C BI-LEV VENT MODE WHT WIRE YEL WIRE

A/C BI-LEV A/C COMPRESSOR CLUTCH COIL A/C COMPRESSOR CLUTCH RELAY (IN UNDERHOOD FUSE/RELAY CENTER) A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (REAR OF A/C COMPRESSOR) A/C COMPRESSOR LOW PRESSURE CUTOFF SWITCH (IN REFRIGERANT LINE) AUXILIARY BLOWER MOTOR AUXILIARY BLOWER MOTOR RESISTOR (LEFT REAR OF CABIN, BEHIND REAR WHEELHOUSE) BLK WIRE BLOWER MOTOR BLOWER MOTOR RESISTOR/RELAY (AT HVAC CONTROL PANEL) BRN WIRE COMPT AT LEFT FENDER) POWERTRAIN CONTROL MODULE (BEHIND (DIESEL) CENTER OF I/P) CONVENIENCE CENTER DIODE (IN UNDERHOOD FUSE/RELAY CENTER) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE EXCEPT 7.4L PNK WIRE FRONT AUXILIARY HVAC CONTROL MODULE FUSE 12 FUSE 24 GASOLINE GASOLINE DIESEL GRN WIRE GRY WIRE HEATER AND A/C CONTROL LOGIC MODULE (FRONT INTERIOR ROOF PANEL) HEATER AND A/C CONTROLLER HOT AT ALL TIMES HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN HOT IN RUN OR START HVAC FUSE I/P FUSE BLOCK LT BLU WIRE LT GRN WIRE OFF LO MED HI OFF MAX ORG/ WIRE PNK PNK 7.4L UNDER- HOOD FUSE/ RELAY CENTER WIRE PNK WIRE PPL REAR AUXILIARY HVAC CONTROL MODULE RED WIRE RR CTRL OFF LO MED HI TAN WIRE TEMP UNDER- HOOD FUSE/ RELAY CENTER A/C FUSE IGN E FUSE UNDERHOOD FUSE/RELAY CENTER RR HVAC FUSE VEHICLE CONTROL MODULE (IN ENGINE VENT HEAT BLEND DEF VENT HEAT BLEND DEF OFF MAX A/C BI-LEV VENT MODE WHT WIRE YEL WIRE

AUXILIARY BLOWER MOTOR AUXILIARY BLOWER MOTOR RESISTOR (LEFT REAR OF CABIN, BEHIND REAR WHEELHOUSE) BLK WIRE BLOWER MOTOR BLOWER MOTOR RESISTOR/RELAY (AT HVAC CONTROL PANEL) BRN WIRE CONVENIENCE CENTER DK BLU WIRE DK GRN WIRE FUSE 12 FUSE 24 GRY WIRE HEAT BLEND DEF HEATER CONTROLLER HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START HVAC FUSE I/P FUSE BLOCK LT BLU WIRE OFF OFF LO MED HI ORG/ WIRE PPL REAR AUXILIARY HVAC CONTROL MODULE REAR AUXILIARY MODE VALVE AND SEAT ASSY (LEFT REAR INTERIOR) REAR AUXILIARY TEMPERATURE VALVE ASSY (LEFT REAR INTERIOR) RED WIRE TAN WIRE TEMP UNDERHOOD FUSE/RELAY CENTER RR HVAC FUSE VENT VENT MODE WHT WIRE YEL WIRE

1995 VFTC BLK WIRE BRN WIRE FUSE BLOCK HI MIST LO HOT IN ACC OR RUN MIST HI MIST OFF OFF 6 8 0 3 0 6 8 OFF LO PULSE PULSE 6 8 0 OFF ON 4 3 0 5 0 PPL PPL WINDSHIELD WASHER/ WIPER SWITCH RED WIRE SOLID STATE WASHER SWITCH WINDSHIELD WASHER PUMP MOTOR (ENGINE COMPT, IN COWL) WINDSHIELD WIPER MOTOR WIPER FUSE 11 WIPER SWITCH YEL WIRE

4-SPEED TRANS. ONLY 5 6 7 8 9 10 PNK PNK PNK PNK WIRE AUTOMATIC TRANSMISSION BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE DK BLU WIRE DK BLU/WHT WIRE ECM-1 MINI FUSE ENG-1 MINI FUSE EXHAUST GAS RECIRCULATION VALVE SOLENOID (TOP FRONT OF ENGINE) FORCE MOTOR FEED SHIFT SOLENOID "B" FORCE MOTOR RETURN IGNITION FUEL INJ. NO.1 FUEL INJ. NO.2 FUEL INJ. NO.3 FUEL INJ. NO.4 FUEL INJ. NO.5 FUEL INJ. NO.6 FUEL INJ. NO.7 FUEL INJ. NO.8 GRN WIRE GRY WIRE HOT IN RUN OR START LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT PNK WIRE NCA WIRE PNK 1 2 WIRE PNK 12 13 14 15 16 WIRE PNK LT WIRE PNK PNK PNK PNK PNK WIRE PNK WIRE PNK/BLK WIRE PPL PPL PNK WIRE PSS SIGNAL BIT 1 TEMP SENSOR SIGNAL PSS SIGNAL BIT 2 PSS SIGNAL BIT 3 RED WIRE RED/BLK WIRE SHIFT SOLENOID A TAN WIRE TAN/BLK WIRE TCC SOLENOID OUTPUT TRANS.) UNDER HOOD FUSE-RELAY CENTER WHT WIRE YEL WIRE YEL/BLK WIRE

19 20 PNK WIRE 5 6 7 8 9 10 PNK PNK PNK PNK WIRE A/C COMPRESSOR HIGH PRESSURE CUTOFF SWITCH (ON REAR PORTION OF A/C COMPRESSOR) BLK WIRE BLK/WHT WIRE BLU WIRE BRN WIRE BRN/WHT WIRE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ECM-B MINI FUSE ENGINE COOLANT TEMPERATURE GAUGE SENSOR (TOP FRONT OF ENGINE) EVAP CANISTER PURGE VACUUM DIAGNOSTIC SWITCH (RIGHT SIDE OF ENGINE) FUEL PUMP PRIME CONNECTOR FUEL PUMP RELAY FUEL PUMP SWITCH, ENGINE OIL PRESSURE GAUGE SENSOR FUEL PUMP, SENDER (PUMP SHOWN) (IN FUEL TANK UNDER REAR OF VEHICLE) GAUGES FUSE 4 GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START HOT IN RUN, START, OFF I/P FUSE BLOCK INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE MALFUNCTION INDICATOR LAMP (MIL) "SERVICE ENGINE SOON" MANIFOLD ABSOLUTE PRESSURE SENSOR (TOP RIGHT SIDE OF ENGINE) MASS AIR FLOW SENSOR (PART OF AIR INTAKE DUCT, TOP FRONT OF ENGINE) OIL PRESSURE GAUGE INPUT ORG/ WIRE PNK PNK 1 2 3 4 5 6 7 8 9 10 11 WIRE PNK WIRE RED WIRE RED/BLK WIRE SPEEDOMETER/ ODOMETER INPUT TAN WIRE TAN/WHT WIRE THROTTLE POSITION SENSOR (TOP LEFT SIDE OF ENGINE) TRANS FUSE 20 UNDERHOOD FUSE-RELAY CENTER WHT WIRE YEL WIRE