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Thanks for posting
It sounds like either the a/c clutch or the compressor is seizing up, this is causing the noise, if you have the compressor removed check to be sure the clutch is not burned out, if the clutch is ok it's most likely the compressor is seizing, the wire is melting due to excessive current drawn by the clutch which in turn can be caused by a seizing compressor.
The white/red wire should not show zero ohms to ground, if it does it is shorted to ground, are there any fuses blown?
Ok, I'll have to get back to you on that, I'll have to check a wiring diagram of the a/c system.
Sorry for the delay in getting back to you, very busy lately.
It seems you're on the right track, try disconnecting the connector on the amplifier, if the short is still there then it's between those teo points, god luck, keep posted. Thanks, Ted.