GMC Pickup C3500 (1985-2000) hot at all times Wiring diagrams

1-2 SHIFT SOLENOID 2-3 SHIFT SOLENOID 29 30 VSS LO (GROUND) VSS HI (SIGNAL) ANTI-LOCK BRAKES SYSTEM AUTOMATIC TRANSMISSION BLK WIRE BLK/WHT WIRE BLU/WHT WIRE BRAKE FUSE 18 BRN WIRE BRN/WHT WIRE CRUISE CONTROL DK BLU WIRE ECM 1 FUSE ECM-B FUSE ELECTRONIC BRAKE CONTROL MODULE ENGINE CONTROLS ENGINE COOLANT TEMPERATURE SENSOR (TOP RIGHT FRONT OF ENGINE) FLUID TEMP SENSOR FRONT WHEEL LOCK FUEL INJECTORS, IGNITION CONTROL MOUDULE, IGNITION COIL FUEL PUMP, OIL PRESS SWITCH/ SENDER, FUEL PUMP RELAY GRY WIRE GRY/BLK WIRE HI LO HOT AT ALL TIMES HOT IN HOT IN OFF, RUN OR START HOT IN RUN OR START HOT IN RUN OR START I/P FUSE BLOCK (UNDER LEFT SIDE OF DSAH) GAUGES FUSE 4 I/P FUSE BLOCK (UNDER LEFT SIDE OF DASH) INLINE GENDER ADAPTOR INSTRUMENT CLUSTER LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MALFUNCTION INDICATOR LAMP ORG/ WIRE PNK PNK WIRE PNK WIRE PPL PPL DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) PPL/WHT WIRE PRESS CTRL SOLENOID RED WIRE RED/BLK WIRE REV, LO RUN WIRE TAN WIRE TCC PWM SOLENOID TCC/ABS/ CRUISE SWITCH THROTTLE POSITION SENSOR (MOUNTED TO SIDE OF THROTTLE BODY) TRANS FUSE 20 TRANS RANGE PRESSURE SWITCH ASSEMBLY TRANSFER CASE CIRCUIT TRANSFER CASE, AXLE SWITCHES UNDERHOOD FUSE/RELAY CENTER (LEFT REAR OF ENGINE COMPT) VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT SIDE OF YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOLENOID 2-3 SHIFT SOLENOID A/T ISS SENSOR VSS IN SENSOR GROUND SENSOR GROUND APP 1 SIGNAL IN ACCELERATOR PEDAL POSITION MODULE (PART OF ACCELERATOR PEDAL) APP 3 SIGNAL IN SENSOR GROUND A/T ISS SENS LO AUTOMATIC TRANSMISSION BLK WIRE BLK/WHT WIRE BLU/WHT WIRE BRAKE FUSE 18 BRN WIRE BRN/WHT WIRE DK BLU WIRE DK GRN WIRE ECM-B FUSE ELECTRONIC BRAKE CONTROL MODULE PPL ENGINE CONTROLS SYSTEM ENGINE SHUTOFF SOLENOID, FUEL SOLENOID EXTERIOR LIGHTS FUEL PUMP, OIL PRESS SWITCH/ SENDER, FUEL PUMP RELAY GAUGES FUSE 4 GRY WIRE GRY/BLK WIRE HI LO HOT AT ALL TIMES HOT IN HOT IN RUN OR START I/P FUSE BLOCK (UNDER LEFT SIDE OF DASH) INLINE GENDER ADAPTOR INSTRUMENT CLUSTER LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MALFUNCTION INDICATOR LAMP ORG/ WIRE PNK PPL WIRE PNK WIRE POWERTRAIN CONTROL MODULE (RIGHT SIDE OF DASH NEAR BLOWER MOTOR) PPL PPL DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) PPL PNK PNK WIRE PPL PRESS CTRL SOLENOID PPL/WHT WIRE RED WIRE RED/BLK WIRE RUN WIRE STOP/HAZ FUSE 1 TAN WIRE TAN/WHT WIRE TCC PWM SOLENOID TRANS FLUID TEMP SENSOR TRANS FUSE 20 TRANS RANGE PNK PNK REV, LO WIRE TRANS RANGE PRESSURE SWITCH ASSEMBLY TRANSFER CASE CIRCUIT TRANSFER CASE CIRCUIT PNK WIRE TURN/ HAZARD SWITCH, CHIME MODULE VEHICLE SPEED SENSOR (LEFT SIDE OF VEHICLE SPEED SENSOR BUFFER (RIGHT SIDE OF DASH) WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOLENOID 2-3 SHIFT SOLENOID 29 30 VSS LO (GROUND) VSS HI (SIGNAL) ANTI-LOCK BRAKES SYSTEM AUTOMATIC TRANSMISSION BLK WIRE BLK/WHT WIRE BLU/WHT WIRE BRAKE FUSE 18 BRN WIRE BRN/WHT WIRE CRUISE CONTROL DK BLU WIRE ECM 1 FUSE ECM-B FUSE ELECTRONIC BRAKE CONTROL MODULE ENGINE CONTROLS ENGINE COOLANT TEMPERATURE SENSOR (TOP RIGHT FRONT OF ENGINE) FLUID TEMP SENSOR FRONT WHEEL LOCK FUEL INJECTORS, IGNITION CONTROL MOUDULE, IGNITION COIL FUEL PUMP, OIL PRESS SWITCH/ SENDER, FUEL PUMP RELAY GRY WIRE GRY/BLK WIRE HI LO HOT AT ALL TIMES HOT IN HOT IN OFF, RUN OR START HOT IN RUN OR START HOT IN RUN OR START I/P FUSE BLOCK (UNDER LEFT SIDE OF DSAH) GAUGES FUSE 4 I/P FUSE BLOCK (UNDER LEFT SIDE OF DASH) INLINE GENDER ADAPTOR INSTRUMENT CLUSTER LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MALFUNCTION INDICATOR LAMP ORG/ WIRE PNK PNK WIRE PNK WIRE PPL PPL DATA LINK CONNECTOR (UNDER LEFT SIDE OF DASH) PPL/WHT WIRE PRESS CTRL SOLENOID RED WIRE RED/BLK WIRE REV, LO RUN WIRE TAN WIRE TCC PWM SOLENOID TCC/ABS/ CRUISE SWITCH THROTTLE POSITION SENSOR (MOUNTED TO SIDE OF THROTTLE BODY) TRANS FUSE 20 TRANS RANGE PRESSURE SWITCH ASSEMBLY TRANSFER CASE CIRCUIT TRANSFER CASE, AXLE SWITCHES UNDERHOOD FUSE/RELAY CENTER (LEFT REAR OF ENGINE COMPT) VEHICLE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT SIDE OF YEL WIRE YEL/BLK WIRE

BLK WIRE CIG LTR FUSE 13 CONVENIENCE CENTER (LEFT SIDE OF DASH) DOOR LOCK CONTROL MODULE (FRONT OF LEFT REAR WHEELHOUSE) DOOR LOCK RELAY (UNDER CENTER OF DASH) GROUND DOOR JAMB SW LOCK SIG UNLOCK SIG PPL GRY WIRE HOT AT ALL TIMES I/P FUSE BLOCK (LEFT SIDE OF DASH, LEFT FRONT DOOR JAMB SWITCH LEFT FRONT DOOR LOCK ACTUATOR LEFT FRONT DOOR LOCK SWITCH LEFT REAR DOOR JAMB SWITCH LEFT REAR DOOR LOCK ACTUATOR LOCK LT BLU WIRE ORG/ WIRE PPL PPL 4 DOOR PWR-ACCY CIRCUIT BREAKER REAR CARGO DOOR LOCK ACTUATOR (CARGO DOORS) REAR DOOR JAMB SWITCH REAR DOOR LOCK SWITCH (CARGO DOORS) RIGHT FRONT DOOR JAMB SWITCH RIGHT FRONT DOOR LOCK ACTUATOR RIGHT FRONT DOOR LOCK SWITCH RIGHT REAR CARGO DOOR CONTACTOR (RIGHT REAR DOOR JAMB) RIGHT REAR DOOR JAMB SWITCH RIGHT REAR DOOR LOCK ACTUATOR RR DOOR SW BATT (B+) TAN WIRE UNLOCK WHT WIRE

B+ SHOCK GRD TAMPER BLK WIRE BODY CONTROL MODULE (IN CENTER CONSOLE) CARGO DOOR JAMB SWITCH CTSY FUSE 3 DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DL BLU/WHT WIRE DOOR LOCK DOOR UNLOCK DOOR LOCK INVERSION MODULE (BEHIND LEFT SIDE OF DASH) DOOR UNLOCK DOOR LOCK GRD B+ HEADLIGHT SYSTEM HORNS SYSTEM HOT AT ALL TIMES I/P FUSE BLOCK LEFT FRONT DOOR JAMB SWITCH LEFT REAR DOOR JAMB SWITCH LIFTGATE JAMB SWITCH LT BLU WIRE LT GRN WIRE ORG/ WIRE PPL RIGHT FRONT DOOR JAMB SWITCH RIGHT REAR DOOR JAMB SWITCH SECURITY LED (IN CENTER OF FLOOR CONSOLE) SHOCK SENSOR (IN CENTER CONSOLE) TAN WIRE WHT/BLK WIRE

260 (CROSS BODY HARNESS, 4 DOOR 4-DOOR 2-DOOR 640 (OR 540) 1576 (OR 56) 294 39 157 1455 150 195 156 BLK (OR BLK/WHT) WIRE BLK WIRE BLK/WHT WIRE CARGO DOOR JAMB SWITCH CARGO DOOR LOCK SWITCH (W/ CARGO DOORS) CIG LTR FUSE 13 CONVENIENCE CENTER (LEFT SIDE OF DASH) DATA LINK INTERIOR CONNECTOR LAMPS (UNDER LEFT SYSTEM SIDE OF DASH) DOOR LOCK CONTROL MODULE (FRONT OF LEFT REAR WHEELWELL) DOOR LOCK RELAY (UNDER CENTER OF DASH, NEAR REMOTE CONTROL DOOR LOCK RECEIVER) GAUGES FUSE 4 GROUND DOOR JAMB SW LOCK SIG UNLOCK SIG PPL GRY WIRE HORNS SYSTEM HOT AT ALL TIMES HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK (LEFT SIDE OF DASH, LEFT FRONT DOOR JAMB SWITCH LEFT FRONT DOOR LOCK ACTUATOR LEFT FRONT DOOR LOCK SWITCH LEFT REAR DOOR JAMB SWITCH LEFT REAR DOOR LOCK ACTUATOR LOCK LT BLU WIRE LUXURY ORG/ WIRE ORG/BLK WIRE PNK WIRE PPL PWR-ACCY CIRCUIT BREAKER REAR CARGO DOOR LOCK ACTUATOR (CARGO DOORS) REMOTE CONTROL DOOR LOCK RECEIVER (BEHIND CENTER OF DASH) RIGHT FRONT DOOR JAMB SWITCH RIGHT FRONT DOOR LOCK ACTUATOR RIGHT FRONT DOOR LOCK SWITCH RIGHT REAR CARGO DOOR CONTACTOR (RIGHT REAR DOOR JAMB) RIGHT REAR DOOR JAMB SWITCH RIGHT REAR DOOR LOCK ACTUATOR RR DOOR SW BATT (B+) SEAT BELT SWITCH BREAKOUT) SUBURBAN/ UTILITY TAN WIRE TRUNK, TAIL- GATE, FUEL DOORS SYSTEM UNLOCK UTILITY W/ REAR CARGO DOORS UTILITY W/ REAR LIFTGATE W/ CARGO DOORS W/ LIFTGATE W/ CARGO DOORS W/O POWER WINDOWS W/ POWER WINDOWS WHT WIRE

BLK WIRE CONVENIENCE CENTER HOT AT ALL TIMES I/P FUSE BLOCK LEFT FRONT POWER LUMBAR SEAT SWITCH LEFT FRONT POWER LUMBAR SUPPORT MOTOR LEFT LUMBAR SOLENOID ORG/ WIRE PPL PWR-ACCY CIRCUIT BREAKER RIGHT FRONT POWER LUMBAR SEAT SWITCH RIGHT FRONT POWER LUMBAR SUPPORT MOTOR RIGHT LUMBAR SOLENOID TAN WIRE

BLK WIRE CIG LTR FUSE 13 CONVENIENCE CENTER HOT AT ALL TIMES I/P FUSE BLOCK LEFT FRONT POWER LUMBAR SEAT SWITCH LEFT FRONT POWER LUMBAR SUPPORT MOTOR LEFT LUMBAR SOLENOID ORG/ WIRE PPL RED WIRE RIGHT FRONT POWER LUMBAR SEAT SWITCH RIGHT FRONT POWER LUMBAR SUPPORT MOTOR RIGHT LUMBAR SOLENOID SUBURBAN, UTILITY ONLY TAN WIRE W/ SPLIT BENCH SEAT W/O SPLIT BENCH SEAT

AUDIO ALARM MODULE (ON CONVENIENCE CENTER) BLK WIRE BLK/WHT WIRE DIESEL GAS GAUGES FUSE 4 GRY WIRE HOT AT ALL TIMES HOT IN PARK OR HEADLIGHT HOT IN RUN, BULB TEST OR START I/P FUSE BLOCK (UNDER LEFT SIDE OF DASH) ILLUM FUSE 14 INSTRU- MENT CLUSTER SAFETY BELTS INDICATOR KEY-IN WARNING BUZZER SWITCH LEFT FRONT DOOR JAMB SWITCH LIGHTS ON INPUT POWER INPUT KEY-IN WARNING LT GRN WIRE ORG/ WIRE PNK IGNITION ON INPUT WIRE PNK WIRE SEAT BELT INPUT GROUND FASTEN BELTS OUT SEAT BELT SWITCH (ON DRIVER'S SEAT BELT BUCKLE) STOP/HAZ FUSE 1 SUPPLEMENTAL RESTRAINTS SYSTEM TAN WIRE YEL WIRE

BATTERY INPUT BLK WIRE BLK/WHT WIRE BODY CONTROL MODULE (IN CENTER CONSOLE) BRN WIRE CTSY FUSE 3 DK BLU WIRE GAUGES FUSE 4 GROUND FASTEN BELTS OUT HEADLAMP, PANEL DIMMER SWITCH HOT AT ALL TIMES HOT IN RUN OR START I/P FUSE BLOCK (UNDER LEFT SIDE OF DASH) INSTRU- MENT CLUSTER KEY-IN WARNING BUZZER SWITCH LEFT DOOR JAMB SWITCH LT GRN WIRE ORG/ WIRE PKLPS FUSE 9 PNK WIRE POWER DISTRIBUTION SYSTEM SAFETY BELTS INDICATOR SEAT BELT SWITCH (ON DRIVER'S SEAT BELT BUCKLE) SUPPLEMENTAL RESTRAINTS SYSTEM TAN WIRE WHT WIRE YEL WIRE