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That is when they seize. The rest of the time they act as and idler pulley

Wait a minute here. If a compressor breaks a belt, it is seized. So, you pay out to have your AC fixed and the compressor doesn't work. As they say, something smells rotten in Denmark. Did it...

Getting current to the compressor?

Yes, female connections in the harness

There should be a plug on the lead to the compressor. You want to jump from the positive source to that wire. Even not running, you should see the clutch go in. If not, clutch is probably toast. ...

You should be getting more than that. Jump it and see what happens

12 V

I assume the engine was running when you did this. Verify power to the clutch with a test light or meter before you buy a compressor

Yes

If you have it charged, then the first thing to check is the low temp pressure switch. It is a safety switch that will not let the compressor engage. It will be located on the high pressure line. ...