GMC C3500 HD (1991-2000) Wiring diagram engine performance 4.3l (vin z)s, m/t

4.3L ONLY 452 455 PPL 7.4L ONLY A/C ON SIGNAL IN BRAKE SW TO PCM AIR CONDITIONING SYSTEM BLK WIRE BLK/RED WIRE BLK/WHT WIRE BRN WIRE BRN/WHT WIRE COOLANT TEMP. SENSOR CRUISE CONTROL SYSTEM CRUISE IND REG GRD DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE DK GRN/YEL WIRE DLC SERIAL DATA DLC THROTTLE POSITION SENSOR IN LO SIDE INJ A ECM IGN FUSE EGR VALVE SOLENOID (4.3L ONLY) (LEFT REAR TOP OF ENGINE) EGR VALVE SOLENOID UPSHIFT IND CTRL ELEC FUEL PUMP IN MAP SENSOR IN ENGINE CONTROL MODULE (UNDER RIGHT SIDE OF I/P) EVAP CANISTER PURGE CTRL EVAPORATIVE CANISTER PURGE SOLENOID (ON ENGINE) FUEL PUMP RELAY CTRL FUSE BLOCK GRY WIRE HOT IN RUN OR START HOT IN RUN, BULB TEST OR START IDLE AIR CONTROL UNIT (RIGHT REAR OF TBI UNIT) IGNITION BYPASS IGNITION CONTROL (IC) VSS BUFFER SIGNAL VSS BUFFER SIGNAL INJ FUSE KNOCK SENSOR IN LINEAR EGR POSITION IN LT BLU/BLK WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE LT GRN/WHT WIRE MIL INDICATOR CTRL ORG/ WIRE ORG/BLK WIRE OXYGEN SENSOR LO PNK/BLK WIRE PPL PPL 1 2 3 4 PPL 18 19 PPL/WHT WIRE RED WIRE TAN WIRE TAN/BLK WIRE TAN/WHT WIRE THROTTLE ACTUATOR CTRL THROTTLE BODY FUEL INJECTOR #1 (TOP OF THROTTLE BODY UNIT) THROTTLE BODY FUEL INJECTOR #2 (TOP OF THROTTLE BODY UNIT) WHT WIRE WHT/BLK WIRE YEL WIRE

4.3L ONLY 423 3 121 PNK WIRE ACCY BLK WIRE BLK/RED WIRE BRN WIRE BRN/WHT WIRE BULB TEST DISTRIBUTOR (CENTER REAR OF ENGINE) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENGINE COOLANT TEMPERATURE SENSOR (RIGHT TOP FRONT OF ENGINE) FUSE BLOCK GAUGES FUSE GRY WIRE HOT AT ALL TIMES HOT IN RUN, BULB TEST OR START IGNITION COIL (CENTER REAR OF ENGINE) IGNITION SWITCH INSTRUMENT CLUSTER KNOCK SENSOR (4.3L ONLY) (REAR OF ENGINE) KNOCK SENSOR (RIGHT SIDE OF ENGINE, BELOW EXHAUST MANIFOLD) LINEAR EGR REGULATOR SOLENOID VALVE (7.4L ONLY) (RIGHT TOP OF ENGINE) LOCK OFF LT GRN WIRE MANIFOLD ABSOLUTE PRESSURE SENSOR (RIGHT REAR TOP OF ENGINE) NCA WIRE ORG/ WIRE ORG/BLK WIRE PNK WIRE PNK/ BLK WIRE PNK/BLK WIRE PPL PPL 1 2 3 4 PPL 18 19 PPL PPL PPL/WHT WIRE RUN WIRE SERVICE ENGINE SOON INDICATOR TACHOMETER TEST LEAD TAN/BLK WIRE TCC/BRAKE SWITCH (TOP OF BRAKE PEDAL BRACKET) THROTTLE POSITION SENSOR (RIGHT SIDE OF THROTTLE BODY) UP- SHIFT INDIC- ATOR WHT WIRE WHT/BLK WIRE YEL WIRE

4.3L 4.3L ONLY 7.4L BLK WIRE BLK/WHT WIRE BRN WIRE DATA LINK CONNECTOR (UNDER LEFT SIDE OF I/P) DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE FUEL PUMP AND SENDER FUEL PUMP IN-LINE FUSE FUEL PUMP OIL PRESSURE SWITCH (LEFT REAR OF ENGINE, NEAR EXHAUST MANIFOLD) FUEL PUMP RELAY (RIGHT REAR OF ENGINE COMPARTMENT, NEAR BATTERY JUNCTION BLOCK) FUSE FUSE BLOCK FUSE LINK (20 GA- GRY WIRE HEATED OXYGEN SENSOR (4.3L) (IN EXHAUST Y-PIPE) HOT AT ALL TIMES HOT IN RUN INSTRUMENT CLUSTER LT BLU/BLK WIRE LT GRN/BLK WIRE OIL PRESS IN ORG/ WIRE ORG/BLK WIRE OXYGEN SENSOR (7.4L) (LEFT EXHAUST MANIFOLD) PNK/BLK WIRE PNK/WHT WIRE PPL PPL/WHT WIRE RED WIRE TACH IN TAN WIRE THROTTLE ACTUATOR SOLENOID (7.4L ONLY) (ON THROTTLE BODY UNIT) VEHICLE SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) VEHICLE SPEED SENSOR BUFFER (UNDER RIGHT END OF I/P) VSS IN WHT WIRE WHT/BLK WIRE