Originally Posted by kirko
Capacitors REAL purpose, is to keep voltage in a time of heavy bass, like continous thumps or long drawn out bass... It keeps the music loud instead of sorta losing voltage and fading out. If you are getting dimming lights a lot, then a cap will not fix your issue...
You should have the same 4ga wire as the ground wire also. And i would ground that somewhere else. That will more than likely fix your issue. ANd as an installer, if you brought your car to my work, it is the FIRST thing i would do... You are talking about going through thin sheet metal, you need to ground to the frame. In my aveo, i grounded my amp to the rear seat belt bolt with a ring terminal. This is where i would start seeing as its extremely cheap to fix. Capacitors, in my time at circuit city for 4 years, and now at GM, dont really help all that much. Its more of a placebo. Its the amp draw, not voltage, that makes your lights dim, and therefore, really is in direct relation of your alternator and power wires, not the battery or a cap.
If your amplifier cannot rid itself of the voltage through the ground as fast as the power, the lights will dim, plain and simple.
Let me know how it goes, and if i can help with anything let me know.