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I am not great with electrics, but no one has replied so far so I'll give it a go.
It is strange that the PO changed batts 3x, it seems he never investigated the actual source of the problem. I don't think it would be the compressor. You need to have a meter that measures where the voltage is going to ground, by trial and error. Iirc, didn't you get one? Put it on that wire and see what it says. What position is the ac switch in?
You could do that in the fuse box also, checking various paths. But you may have to take it to someone who knows electrics. I can say that this is uncommon on these cars.
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