Crackedback's headlight relay kit
@wheelsport
You have other issues, like ground hunting is my guess.
My kit would have zero effect on the taillights and high beam indicator light.
If the brightness intensifier kit was one of the low dollar chinese kits, the only similarities to my kits is it has relays. My kit takes into account the deficiencies in the mopar system that those kits do not.
If you haven't done anything to the charging system path and the instructions say to hook up the single power wire at the battery for full battery power.. that is a BAD approach on most OEM wired muscle era mopar. Biggest hint, if you pull the headlights on with engine running and the ammeter shows a HIGHER + charge rate = BAD.
The other test with engine off. Pull switch to first stop, running lights on, note ammeter position, should be slightly negative. Pull headlights on, if the ammeter doesn't move further negative by a good margin, that's bad.
I got no dog in this with you, just don't want to see your car end up in a bad situation.
Good luck with it. You may want to start a separate thread as to not get this one off track.