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Old 02-03-2018, 03:17 PM   #1
72farmer
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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.

Last edited by 72farmer; 02-03-2018 at 03:34 PM.
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Old 02-03-2018, 08:11 PM   #2
natedogg
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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?
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Old 02-03-2018, 08:23 PM   #3
gmachinz
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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.
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Old 02-03-2018, 09:05 PM   #4
72farmer
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Re: need help finding a/c compressor wires on 85 GMC

Thanks for the help.I found it.
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Old 02-03-2018, 11:15 PM   #5
Wwes
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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?
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