My 80B, 47,000 miles, original alternator, all lights (dash, headlights, etc.,) will dim, get bright, then dim; doesn't happen alot but enough to notice. I put a new belt on and tightened it to spec.'s but no change. I am thinking it is the alternator, since it is my weekend ride can I get away with driving it until it gets worse or should I replace the alternator now? There is no drain on battery that I can tell. What do you think? Thanks.