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Per my radio issues thread I finally got the double-din Sony installed when I discovered a previous owner had monkeyed with the Porsche wiring harness. The constant 12v was no longer receiving power and they had run a new constant 12v, which was tied into the 12v switched, and a new "ground" which may have been the cause of my alternator whine.
Everything is now working, the new speakers sound great(though still lacking bass), and I did not experience alternator whine when I took it out for a drive yesterday.
Oh, and I replaced their jury-rigged parking break switch as well.
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