I think the alternator has an internal voltage regulator, but I'm not sure. In any case, pull the alternator and have it bench tested. That will tell you whether or not the alternator is good. Buy a service manual, it will come in handy. No matter what the test results are on the alternator, undo the mess that you have going on w/ the ignition switch. Your issue may be a combination of things, but start w/ the obvious.
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