Wiring Diagram For 1985 Chevy Truck

I need a wiring diagram specifically for an 87 chev 4x4 with dual tanks, if it even exists. All kinds of one offs here, mostly TBI on the 73-87 body style. I'm donoring a cab from a 2 wheel drive single tank to a 4 wheel drive dual tank system and need to know the wiring for the tank switch and where to tie in the 4wheel indicator light.. The main wiring diagrams are laid out so that the After the main diagrams are systems diagrams. diagram corresponds in position to the actual wiring in These supplemental diagrams simplify the circuit trac­ the vehicle. Therefore, the headlight circuitry is located ing for the technician. on the left side of diagram and then progressing to the

Here are the complete wiring harness schematics for the 73-87 series pickups. These are HUGE jpgs so you may want to save them to your hard drive and print the pages you need. 73-76 diagrams 73-76 cab Interior 73-76 chassis rear Lighting (chassis/cab and Stepside 73-76 chassis rear Lighting (Fleetside and Suburban 73-76 engine and Front Lighting. does anyone have a heat/AC wiring diagram for a 79? In my rewiring i seem to have ended up with constant power to the yellow wire to the heater resistors which results in the heater fan drawing 1 amp when its off.. 74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10. 79diesel. Registered Users; Posts: 130; Re: heat/AC wiring diagram « Reply #4 on.