1987 jimmy 350 my a/c was working right when i purchaced the vehicle it started to get worse and worse until it would just screach when i turned it on. I then rebuilt the engine and forgot about it. a couple wires were ruined. I have a harrison aftermarket compressor but looks the same i was wondering if anyone knew how many wires should go to the compressor i can only find one. Any suggestions would be appretiated.