I still say, stay away from the caps, and/or new alternator. Just because of some dimming, won't mean you need a whole new alt. I managed to shove over 1600wrms into my car, without any problems with my alt for over 3 years, and counting. Try upgrading your battery cables first. Even down to 2 gauge wires. If all of that fails, and you JUST HAVE TO get rid of the lights dimming, then buy a really small cap (.25 farad?) and put it on your cars accesories, rather than your stereo.
