I recently upgrade the alternator to the biggest amperage they have for my vehicle, upgraded the battery and updated wiring from the alternator to the battery. I still get headlight dimming when the volume is set to 30 on my kenwood Excelon DNX6990HD. I was told that a capacitor would fix the problem. And I also heard the a capacitor is bad for a system. Anyone have any opinions about this? Should I get a capacitor? Or should I stay away from a capacitor? any help would be appreciated.