grounds should be good. i have 2 amps 1 for sub and 1 4 channel. I first had the sub amp installed about a year ago. it had a bad ground first go around so brought it back and they redid all the grounds for it and it was perfect. This amp is grounded to the same place so shouldn't be the problem? also when i first brought it back for alternator whine he checked all grounds to make sure they were good. only thing i can think of is the power cables and rca are ran through same side of car but ive heard that doesnt matter much anymore with the wiring they have available now-a-days. its picking up EMI from somewhere though and i just noticed the lights have a lot to do with it. should i start by moving rca's away from power cables?
