lights dim or intensify according to rpm's

[cycloneb18c3]

im pretty sure its the alternator, I would either get one that puts more amps out or, get one from pep boys cause they have a lifetime warranty. I have held them to this warranty and exchanged 4 alternators- cause of my system bumpin until I got a capacitor.

 

[jamesA]

My Si does the same thing, low RPMs it sits there and you can actually see the lights dim, but as soon as I get on it they get brighter...I just figured it was because Honda uses some tiny ass batteries in their cars.