Wierd Charging Problem - Voltage regulator?

[MattBelliveau]

New prob.

When I left for work today, I noticed that my brake and fuel low idicator wouldn't turn off. This is usually true when I first start the car, but goes away as soon as I hit the accelorator. Now, throughout the day, I've started it a few times, and a couple of the times, it sounded like it wasn't getting enough power, but it started OK. On the way home, my stereo started acting like it wasn't getting enough voltage (turn on, turn, off, turn on, etc.). By the time I was about 5 mins from home, I had almost no headlights, windows barely worked, etc. I imagine I wasn't charging for about 20 mins. As I was getting off the highway, everything became normal. Then, three minutes later, I was going dead again. Everything appears to be there (belts, alt. etc.) Does this sound like it might be a voltage regulator problem? Is it possible to test one of these? Thanks!