Thanks Simon. I have set my multimeter to "sound" with continuity.
From C to R no sound. From C to S no sound. From S to R sound.
For ground, C to the compressor its self (with some of the paint scratched off to reveal metal) no sound. From R to the compressor sound and from S to compressor sound.
Do I also need to remove the green ground wire from the compressor, in addition to the 3 n' 1?
Looks like I have a dead compressor.