[Ronbo]

Ya that's probably a good idea at this point. Sounds like multiple problems or mis-wiring.

Except for nostalgia, external regulators are just an annoyance you don't need. Most of the auto mfgs. dumped them through the 70's with good reason.

The old GM internal reg alternator is tough to beat for reliability. I converted a couple of my old Chevys to these to get rid of the relay-based regulators they used.

Sorry, I wasn't more help to you. This stuff can be a little tough to diagnose without being there.