I have a 2004 chevy impala I had installed sounds to it. It now has a mono block amp 3200 watts 1 channel amp. 2 square 12's kickers. An equaLIZER AND A CAPACITOR. Every time I sub my music my dashboard and headlight always dims. I am wondeing if maybe another capacitor would do the job or maybe rewiring some cables

At those ratings are you sure that your alternator is strong enough to run the system ? 3200 watts is a great amount of power.