Silver MemberUsername: Jeremyc
Kunsan AfbSouth Korea
Post Number: 301
Make sure you take a wire brush and remove all paint and dirt so that you are getting the best signal possiable. If you are using the factory ground on your head unit, I would move it to a firm peice of metal behind your dash. Make sure you run a new wire from your alt to battery, battery to ground, and if you want battery to engine block. I normally leave the factory wire and just add in a second 4 guage or 0 guage wire.
Next thing, you want to make sure your rca wires and power wires run down the opasite sides of the car. Something else to keep in mind, if your power to the amp is 4 guage you want your ground for the amp to be 4 guage too. This will probably fix it, if not I would see about swapping out your amp or deck. They might be causing the problem. However it is more than likely a grounding issue.
Gold MemberUsername: Glasswolf
NorthWest, Michigan USA
Post Number: 6992
you probably have a bad ground at the amp or the ehad unit.