SYMBOLDESCRIPTION1Charge Lead, Auxiliary Battery2Brake Pressure Modulator Vave3Engine Harness4Underhood Fuse-Relay Center5Brake Lamp Relay6Maxi Fuses7Auxiliary Cooling Fan Relay8A/C Compressor Clutch Relay9Horn Relay10Fuel Pump Relay11Forward Lamp Harness12Vehicle Control Module (VCM)13Auxiliary Battery GMC Sierra 1500 Pick Up 1996 Engine Electrical Circuit Symbol Map