1966 dart problems, help

An original charging system for a '66 Dart would have just the large black battery wire and the small green field wire. They also had a point type regulator with two separate wires. If yours has been changed to something else, you may have to have an auto-electric shop figure out what you have. Starting in '70 they used a 3 wire setup that had 2 field wires and a solid state regulator with a rubber 2 wire connector that plugged into it and a metal retainer to hold it on. It didn't matter which of the two field wires were which terminal of the alternator. Overcharging is almost always a regulator problem but if you have bad wiring or wrong components, it could be many things.
Thanks, Mark