Thanks. Well, I dont have any of those testers/gauges, so I simply removed and cleaned the terminals on the battery and cables. Presto, it didnt do it again (stumble and lights dimming/brightening) and it ran perfectly today. I am thinking this was the problem, because I had an issue in the summer when it was like I was losing a connection and it would start to stall. I think my cable ends are worn out.

Anyway, I guess it could still be a tiring OVP relay. It did kinda stumble like an old diesel when first started for about 15 seconds, but its usually not as cold here as it has been for the past few days, so I am experiencing things this car (and my others) dont do unless its bitterly cold. It was only 25° here when this was occuring, so I would hate to live where it gets below 0°, or I would be in trouble. lol. For now, all seems OK again.

Its also good to read that the voltage regulator is so easy to replace! Thanks for that Ferdman!

Thanks again.