the voltage regulator is 1/2 of the alternator, ie makes the current and stabilizes it, the bearings, windings and diode plate make the ac, and straighten it into dc. does it get brighter with higher revs? that might be the regulator portion of the voltage regulator (as opposed to brushes). you can always take it to autozone and see if they can rule out which half (battery or alt.) is doing it, then figure out what you have to do from there. i take it it is still driveable? hopefully if it has something to do with your alternator, its just the regulator, i don't think that anybody here has come up with a solution for a diode plate problem that will work in a regular e34 alternator.
ps....pls disregard half the stuff i said above. it sounds like your battery is dying. how old is it?
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