You do not have a positive ground system. Maybe someone put a dead battery in and tried to charge it backwards dunno. A extra wire comes out of the harness that plugs into the reg., But that should be for the radio condenser and that is yellow on a 66, Dunno color on 64. seems like you must get a Jim Osborn wiring diagram book and shop manual to straighten out your wiring situation before you start buying and switching componets.
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