[KTL]

Had the same problem on my car. New alt. fixed it.

Definitely a wise idea to get a digital handheld voltmeter (or a nice sensitive analog) in the system so you can see the charge characteristics of the alt. as revs change. An extreme overcharge situation is bad news.

I experienced this first hand with a faulty reman alt. I happened to be installing some gauges at the same time I did my alt. When done, my VDO slow-sweeping voltmeter would sway back and forth, and then go to max. Well that blew out my headlights (expensive 80W/100W H4 bulbs of course) and made some other things go wacky- same seatbelt light came on like darrin mentioned. So get that alt. replaced sooner than later!