Hey Guys - Have a 67 Coronet wagon with a overcharging problem. Tried 2 new voltage regulators, 2 alternators, new engine wiring harness, sanded down mating surface of voltage regulator to ensure a good ground (with strap to engine) and still overcharging. It will pin the gauge needle to the charge side (18v) on aftermarket gauge and does the same with the factory dash gauge. It has also been confirmed on a auxillary gauge that it is in fact overcharging.

Havn't found any obvious wiring mixups, so I'm a little stumped as to why I still have an overcharging issue. Would it be easier to just get an internally regulated alternator, or is that just a band aid for a potential wiring problem?

What are your thoughts? Thanks