71 Dart overcharging

Well that shows that wire is undersized, think "overloaded." Surely you don't have the VR powered off the load side of the ballast?

What have you got for a power feed, IE you have a small wire from battery to up front, or you tapping off the starter for power? What are you using for a harness or switch?

Yep. Relay. That is one way.

Haven't had time to look at any thing. The wiring is stock. Yes, power for ballast, and VR are on same source which is stock (per factory wire diagrams). The batt. in the trunk is the only non stock part of the system. It is wired from same location at the relay (or starter) as the stock batt cable, just a heavier and longer to the trunk. Engine is grounded to fire wall via a batt cable. I married into this car, most of this was done before me. I cleaned a few things up.
Going to check it out tomorrow, and will post. Thanks Guys