Pretty sure I am dealing with an R12 configuration.
I put power across the input line and the compressor casing - Clutch engaged.
Now I have two challanges yet to solve:
1. How to get a solid ground to the compressor. There are three mounting bolts - 2 are on the mounting plate and appear to have insulator/shock mounting systems which would inhibit a good ground. The third is on the adjustable arm used to tension the belt - it also has a insulator/shock mounting system. So, if those are the three contact locations, I would figure that one of them needs to be assembled such that there is a good ground connection using washers designed for continuity purposes. Either that or I am missing a wire or a concept some where. Here is a picture of the compressor.
2. Continue to trouble shoot the voltage path through the temperature switch because even if the clutch will work, I have to succesfully get power to the clutch via the normal circuit. Off to pursue this path as I ponder the ground issue.