the alternator is a 65 amp. I will try the grounds, thought i had them covered. new ground strap and engine compartment grounds. I guess i will re check.
All of the cars interior power goes through a fusible link at the bulkhead connecter and through the amp gauge. The resistance could be simply in the headlight switch and its connecter or just the dimmer switch but more often the dimming lights is a sign of entire electrical system issue and not just the light circuit.