No POWER to AC Compressor..Questions

[Motorhead]

I am working on my daughters '85 300D. I can't get ANY power to the AC compressor. I have NO POWER to the plug that goes to the compressor clutch.
I will tell you what I DO have.
1) System is charged.
2) Fuse is good, have power to blower and it is working. AC clutch on same fuse.
3) I have power to BOTH sides of LOW pressure switch on drier.
4) Compressor WORKS if I hook it up to EXTERNAL power source.
5) I exchanged the climate control push button assy with a good one.
6) Have power to both sides of freeze switch.

Is there a load relay somewhere that I can check or is that in the climate control switches?