head lights
voltage regulator or not enough altenator
Actually, probably not
Are they flashing on/off like a turn signal? Or just getting bright, with engine RPM, and low, at idle?
It is important to understand that the headlight switch receives UNfused power from the ammeter circuit. The headlight switch has a CIRCUIT BREAKER built into the switch
So if the lights are flashing on/ off it could be:
A bad breaker, IE bad switch
Bad contacts in the switch causing heating, causing the breaker to trip
Bad connections in the switch harness connector, causing heating
A short somewhere in the headlight circuit
Too heavy headlights, IE big wattage aftermarket lamps
etc........ etc.......
It may be possible that OVER voltage because of a problem in the charging system is causing the breaker to pop because the lights will be drawing more current.
