why are all of my lights (headlights, dash, radio, etc...) flicker when I turn my radio up?
I have a small amp, subwoofer, and capasitor (to control light dimming) in the car. Also I have a brand new Optima battery. Could the voltage regulator in the alternator be bad or going bad?? Even when I turn the bass to zero it still flickers the light from time to time. Also the voltage meter sits at about 13 normally but drops to 12 when all accessories are on.