||06-08-2010 11:36 PM
From what I've been able to tell so far, the amp is changing the idle setting when I turn ON the ac switch. The amp may also monitor the high-low press switch as a protective function, and toggles the 12v relays for the compressor and the condenser fan.
I'm not certain that the 1987 ac kit had a compressor relay, and hope to be able to "ring" out an answer tomorrow.
If the ac amp is the defective, I've been giving some though to eliminating it and instead using the a/c switch power to engage 2 relays. one for condenser fan and the other for the compressor. I do give up some protective functions but if that is something that is CRUCIAL, I could put some kind of safety to monitor the pressure switches.
I don't know jack about ac systems, are there any issues I could be missing?
One more question.....could a high or low port pressure cause a newly rebuilt compressor to not function (ie....when 12vdc applied directly to the compressor, the clutch does not engage) AND (no "click" sounds when 12vdc is applied to compressor when engine is off).