How do you fix this?

[TheSunDanceKid]

um if its just your lights on your radio dimming and turning off you have a **** ground on the radio if other things are dimming headlights and dash lights upgrade by going down to your local audio shop grab a piece of 4gage or 8gage wire 2feet or so with a connector on both ends and run a second ground from the negative on the batt to a good solid metal i usally go with the radiator support theres usally a bolt easy access just clean the paint off real good and this will fix your lights dimming and upgrading the radio ground not the amp but the radio good scraped off bare metal will fix the radio

a 140amp alternator is damn decent for a pretty big stereo and alot of other shiot dont use a cap thats just a bandaid for the problem a second battery and isolator is just a little over board and the cost it will how ever fix the issue why? you will be adding a new ground strap in the prossess clean your stock ground strap and just run a second gound for a perment quick and like 10 bucks fixes the issue CORRECTLY