[Jim/GA]

OK, lots of good info here.

The voltage regulator is solid state and built into the alternator. It can't "stick". It can be going bad, though. Need to have it tested.

Your low voltage with lights on could also be due to:
- the high load of the headlights is slowly overheating your alternator/regulator and output is dropping
- you could have a short in your headlight wiring, causing a very high current draw when those lights are on, pulling the voltage down. Look at your ammeter when lights are on and off, in addition to the voltmeter.

One of the pilots in Top Gun tapped the fuel level indicator on his jet when it was low and flashing red. Very funny.