Compressor locks up

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First off, it sounds to me like your compressor is seized. Maybe it got filled with oil.
It doesn't sound like a wiring problem.

Try turning the compressor by hand. You should be able to, even with the belt on, since the clutch disconnects the two. There should be some resistance, but not too much. If it is hard to turn, but you are able to turn it then keep turning it for a while to pump the oil through it.
My guess is that you had the compressor sitting kind of low when swapping the engines and the oil settled in the compressor or near it.