GMC Rally G2500 (1985-1995) brake/ transmission shift interlock relay Wiring diagrams

3-2 CONTROL SOLENOID SHIFT SOL B 5 VOLTS REF BATTERY POWER BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BRAKE/ TRANSMISSION SHIFT INTERLOCK RELAY BRN WIRE DATA LINK CONNECTOR (PARTIAL) DK BLU WIRE DK BLU/WHT WIRE ECMB FUSE ENGINE SPEED SENSOR (TOP REAR OF ENGINE) ENGINE SPEED SENSOR IN SENSOR GROUND TP SENSOR INPUT FORCE MOTOR HI IGNITION FORCE MOTOR LOW FUSE FUSE BLOCK- I/P GAGES FUSE GRY WIRE GRY/BLK WIRE GRY/RED WIRE HEAVY DUTY ELECTRONIC 4-SPEED AUTOMATIC OVERDRIVE TRANSMISSION HOT AT ALL TIMES HOT IN RUN OR START INSTRUMENT CLUSTER SYSTEM LT BLU/WHT WIRE LT GRN WIRE MANIFOLD ABSOLUTE PRESSURE SENSOR (REAR OF ENGINE COMPT, CENTER OF SAFETY WALL) ORG/ WIRE ORG/BLK WIRE PNK RANGE MODE SELECTOR A RANGE MODE SELECTOR B RANGE MODE SELECTOR C WIRE PNK WIRE PNK/BLK WIRE PPL PPL BRAKE SWITCH INPUT 2-3 CONTROL OUTPUT PRESSURE CONTROL SOLENOID RANGE MODE SELECTOR RED WIRE RED/BLK WIRE SENSOR (LEFT SIDE OF TRANSMISSION) SERVICE TRANS OUTPUT DLC INPUT SHIFT SOL A SHIFT SOLENOID B OUTPUT SHIFT SOLENOID A OUTPUT DLC INPUT SPEED SENSOR INPUT TRANSMISSION SPEED INPUT TRANSMISSION SPEED INPUT SYSTEM GROUND SYSTEM GROUND TAN/WHT WIRE TCC SOL TCC/BRAKE SWITCH (BELOW LEFT SIDE OF I/P, ABOVE BRAKE PEDAL) THROTTLE POSTITION SENSOR (ON INJECTION PUMP) TRANS- MISSION TEMP TRANSMISSION CONTROL MODULE (TCM) (BELOW DRIVER'S SEAT) TRANSMISSION INPUT SPEED TRANSMISSION TEMP INPUT MAP SENSOR INPUT VEHICLE SPEED SENSOR BUFFER WHT WIRE WHT/BLK WIRE YEL/BLK WIRE

** (RIGHT FRAME RAIL, NEAR BATTERY) A/C COMPRESSOR CLUTCH AUXILLIARY COOLING FAN AUDIO ALARM MODULE AUTO APPLY PARK BRAKE DATA LINK CONN- ECTOR POWERTRAIN CONTROL MODULE (PCM) AUXILLIARY COOLING FAN COOLANT PRESSURE SWITCH BATTERY BLK WIRE BLK/WHT WIRE BRAKE TRANSMISSION SHIFT INTERLOCK SOLENOID BRAKE/ TRANSMISSION SHIFT INTERLOCK RELAY CRUISE CONTROL MODULE DAYTIME RUNNING LAMPS MODULE DAYTIME RUNNING LAMPS RELAY FUEL PUMP FUEL PUMP RELAY G# N/A (AT LEFT REAR FRAME RAIL) G# N/A (AT LEFT SHIPPING PANEL) G#S N/A (IN FORWARD LAMPS HARNESS) HEADLAMP DIMMER SWITCH I/P CLUSTER LEFT HIGH BEAM HEADLAMP LEFT HIGH/LOW BEAM HEADLAMP PROVISIONS FOR LEFT SIDE MARKER LAMP PROVISIONS FOR RIGHT SIDE MARKER LAMP RIGHT HIGH BEAM HEADLAMP RIGHT HIGH/LOW BEAM HEADLAMP TAN WIRE TRANSMISSION RANGE INDICATOR LAMP VEHICLE SPEED SENSOR BUFFER W/ DAYTIME RUNNING LIGHTS WHT/ BLK WIRE WIPER/ WASHER SWITCH