need help finding a/c compressor wires on 85 GMC
 

I have a 85 GMC Sierra Classic.I am going to try to get the a/c going.I can't seem to find the wire going to the compressor.The compressor has 2 wire terminals on it.I thought most older vehicles that had a/c on them only had 1 wire to compressor.The negitive ground was done through engine ground and mount.

I need to know what color wire or wires would come from pressure switch and go to the compressor.

Re: need help finding a/c compressor wires on 85 GMC
 

The wires are green. As you can see, the a/c compressor has its own Lil harness that branches off. Went out and snapped a pic of the Lil harness on my 85. I think I have a extra harness out in my garage, if you need?

Re: need help finding a/c compressor wires on 85 GMC
 

The AC subharness on the right in the pic is the one you need. The dark green is compressor clutch +12V and the light green wire goes to carb idle stop solenoid. The AC comp clutch negative grounds to your thermostat housing bolt.

Re: need help finding a/c compressor wires on 85 GMC
 

Thanks for the help.I found it.

Re: need help finding a/c compressor wires on 85 GMC
 

Anyone know what year they had a high-pressure switch on the back of the compressor?