Full Rewire 1979 c-30

[thechief]

im in the process of re wiring the whole truck and I have a few things that i cant figure out, in the new harness I just have one wire for the AC where would I wire that to? im guessing it should go to the plug behind the controls but what which wire? same think with the wiper switch, I only have 1 wire inside the cab and 1 wire outside but there is multiple wires on the switch and on the motor.

 

[Rickf]

What brand harness do you have? Are you trying to marry an aftermarket harness to stock GM? Did it come with an installation guide?

 

[Matt69olds]

Most of the options on GM vehicles of this vintage have individual harness that plug into either the fuse box, or a dedicated connector in the dash harness.

In the case of the climate control, either the standard heat or the A/C harness will plug into the brown wire labeled Heater.

 

[kkgp81]

You will probably need the add on AC harness. The AA should work with either AA or Painless. https://www.summitracing.com/parts/aww-510712/make/chevrolet/model/c20-suburban/year/1986

To go in the existing the wire going over there should be as below


AAW has provided the heater or A/C feed wire only for this application to be used in conjunction with your OE factory heater or A/C harness. The mating connector and terminals for the connection located in the loose piece kit of the dash harness. If you desire a new heater or A/C harness for your truck, contact AAW for the exact application for your truck. (The orange A/C high speed blower power feed from your OE A/C harness can be plugged into the accessory plug #7, as shown on sheet 3 by removing the black connector from the wire and installing the bare terminal into the mating cavity of the RED wire at that accessory plug). Brown 12 volt accessory feed to heater / A/C switch. (if using aftermarket A/C, use this brown wire as the keyed accessory feed wire to a/c harness.


This is from the Painless setup

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[thechief]

What brand harness do you have? Are you trying to marry an aftermarket harness to stock GM? Did it come with an installation guide?

Speedway motors, full re wire didn’t keep anything outside the plugs for certain things and I spliced them to the new harness