Gmc  Full Size Pickup 1987-
 PART   COLOR  LOCATION
 12 VOLT CONSTANT   RED (+)   @ IGNITION SWITCH HARNESS
 STARTER  PURPLE (+) or YELLOW (+)  @ IGNITION SWITCH HARNESS
 STARTER 2  N/A  
 IGNITION 1  PINK (+)  @ IGNITION SWITCH HARNESS
 IGNITION 2  N/A  
 IGNITION 3  N/A  
 ACCESSORY/HEATER BLOWER 1  ORANGE (+)  @ IGNITION SWITCH HARNESS
 ACCESSORY/HEATER BLOWER 2  N/A  
 KEYSENSE  N/A  
 PARKING LIGHTS ( - )  N/A  
 PARKING LIGHTS ( + )  BROWN (+)  @ HEADLIGHT SWITCH
 POWER LOCK  LIGHT BLUE (TYPE A)  IN DRIVERS KICK PANEL
 POWER UNLOCK  BLACK/WHITE (TYPE A)  IN DRIVERS KICK PANEL
 DOOR TRIGGER  WHITE (-)  @ UNDERDASH LIGHT
 DOMELIGHT SUPERVISION  USE DOOR TRIGGER, (Requires Part #775 Relay)  
 TRUNK RELEASE  N/A  
 SLIDING POWER DOOR  N/A  
 HORN  BLACK (-)  @ STEERING COLUMN HARNESS
 TACH  WHITE (AC)  @ IGNITION COIL or DISTRIBUTOR
 WAIT TO START LIGHT  N/A  
 BRAKE  WHITE (+)  @ SWITCH ABOVE BRAKE PEDAL
 FACTORY ALARM DISARM   N/A  
 ANTI-THEFT  N/A  
 EXTRA INFORMATION