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Originally Posted by MT-2500
With out a amp meter it is hard to test, but a quick test would to be run a fused jumper wire to it.
MT
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O.K. I might be missing something here. If the fuse is blowing IMMEDIATELY upon turning the switch on, that sounds like a short, and a bad one. Even if the compressor is locked up solid, the clutch is operated by way of an electro-magnet and should still work, making the Belt squeal like a stuck pig. The fuse may indeed blow, but would it blow immediately?
It is very possible that the magnet has shorted due to a rub or something, resulting in a compressor that won't spin, but this sounds too much like an electrical short to me. Like you said, A fused jumper wire would help to determine if the problem is at the compressor or somewhere else.
Inspect your wiring and connectors going into the compressor for shorts, bare spots etc. Sometimes those things end up touching the rotating stuff. If you don't see anything, you can jumper the positive side of the battery to the compressor with a fused wire. Use the same size fuse as in the fuse box that blows. If the compressor runs, look for your problem upstream. If the fuse blows, I'm thinking the magnet is shorted.