I've read a number of good posts regarding an a/c clutch that won't engage. Here is where I am at:

- a/c relay wasn't performing so I resoldered all of the joints and now it works.
- a/c system has enough pressure to close the pressure switch on the receiver dryer.
- 2.9 ohms between the fan clutch green wire and chassis ground. Is this good?
- 0.0 ohms between a/c compressor body and battery ground. This is good, right.
- I ran a ground jumper wire from the battery negative to the body of the a/c compressor. Still know clutch engagement.
- 13.46 volts at the green wire disconnect, disconnected (engine running).
- 12.30 volts at the green wire, disconnect connected (engine running). I would expect the voltage drop due to the resistance. Darned if I know the formula to predict the drop in voltage.
- 12.30 volts at the green wire just before it goes behind the clutch.

To completely eliminate the black ground wire chassis to a/c compressor I guess I have to remove it, test it and clean it.

At the top-center of the compressor the green wire disappears into the body and then comes back out. Is there a sensor or something in there? I get the same voltage on both sides of it.

Any other thoughts or a previous post I missed in my search?