Troubleshooting the not working A/C in my 1997 Ford E350 Motorhome Chassis.

1. Compressor clutch spins freely
2. Started vehicle and turned on A/C, clutch not egaging
3. Unplugged Compressor clutch plug, and engine would turn over but not start
4. Replugged, started engine (normal), and when I unplugged the compressor clutch plug, the engine immediately cut-out.

Is this normal? I was planning to check if I had 12v at the compressor plug.

Did I miss something?

It is almost as if the clutch is wired into the ignition circuit...

Bill
Richmond, VA

 

That ain't the compressor coil plug, it's the crankshaft sensor. The engine cannot run without that sensor's signal.