I have a 92 240 with R134 conversion. The black wire on the top front of the compressor which goes to the magnetic clutch is grounded. I can't see where it is grounded on the outside. It must be inside. Is this normal? Anybody else experienced this?

 

You mean "grounded" like it shouldn't be grounded? Never heard of that being an issue unless the wiring was bad or got damaged somehow...

 

so I assume the clutch is not engaging

is the wire connected to (i believe) the green wire coming from the cars wire harness (it'll have a round connector)

 

generally starting at the alternator, the wire goes to the pressure switch on the bottom manifold on the condensor at the radiator, then from there it goes to the pressure switch on the AC Dryer/reciever (beer can looking thing near the firewall) and from there it goes to the dashboard A/C control switch. the dashboard outputs 12V to activate the compressor, both pressurestats have to be closed to complete the circuit, and 12V goes to the clutch to fire it.

how did you determine this wire is grounded? the clutch itself is a fairly low resistance to ground, maybe 20 or 50 ohms or something, but not 0 ohms.

 

Hello, I have 12v to the low pressure switch and 12v to high pressure switch. But the a/c clutch is not engaging. I put a clip on all of the switches, but nothing. Looks like the power is not going to the clutch. 2 days ago I charged the system and runned very good for testing. Next morning I went to my job and I did not engage. I think it could be the clutch.