Macdrone, thanks for all the advice. I tested the switch, and it's open. That's whats baffling me. The static pressure is 4.5 bar. The fans to cut out when I disconnect the low pressure switch. I guess that just turns off the whole system, and not just the compressor?

Assuming the previous owner is telling the truth, I wonder if my shop missed something when installing the new engine wiring harness. There is that one mystery plug in that last photo above. The fact that the compressor finally did come on if only for a few seconds tells me something. Not sure what though.

Can anyone tell me what that thick two pole plug/receptical combo next
to the drier is for? It was also disconnected.

__________________
Jay Kickliter
Chasing 'trons (my thoughts and tutorials on electronics and stuff)


1995 E300D-Black on Black