86 Kenworth T600 AC question.

[MoJeeper™]

Full of freon, but I'm not getting power to the compressor. Checked fuses and relays all seems to be fine.

Only way I can get it to run is bypass the relay, but then it just runs and doesn't kick off. I need a wiring diagram, but not having any luck finding one.

Any suggestions?

[haleiwa]

Should be a low pressure and a high pressure cutout switch, probably wired in series. Sometimes they are stuck. Those are usually normally open switches and the gas pressure closes them. Can't tell you where they would be located, but sometimes they are near the filter/accumulator housing.

[MoJeeper™]

I found one switch right on the expansion valve. It has 4 wires, one hot. Jumping the wires didn't help.