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Welcome to Classic Olds!
Where are you measuring the voltage at? That can help diagnose the problem...
Yea, the reg or alt could be suspect, especially if you are measuring at the battery posts.
Does turning on the heater fan, wipers, or defroster do the same thing?
I assume you have stock bulbs in the brake lights (which draw about 7.5 amps total)...
If voltage looks okay at the battery posts, there could be bad connections, breaking wiring, or improper wire gauges in wiring that had been replaced. Let us know what you find...
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-Rob Young 
1972 Cutlass Supreme Convertible (442 clone) -"Lady" (My mistress...)
http://www.flickr.com/photos/robsalbum/sets/
1986 Cutlass Supreme Coupe - "Pristine"
1978 Ford (Old Faithful) a.k.a. "the Tramp"
1997 Cadillac STS (for sale - too many cars!)
1999 Harley Davidson Sportster - "the Freedom Machine"
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