I have all ground wire upgraded to 4 guage. My power for the amp is 4 guage. I think it might be my battery. I am getting a optima battery this weekend yellow top. Hope it helps.

The thing with the alternator is it is only 140 amps at a certain rpm. when your at ilde its not giving its full amperage. therefore I would go with a optima battery first then alternator. I am running HIDs and Autodimming mirror with compass. Its fine when I am rolling its just when I am idleing.