PLEASEEE DON"T EVER USE A GROUND LOOP ISOLATOR!!!

that is the band-aid way of doing it...

if you are still getting alot of noise coming from a clean connected ground, then maybe it's not your ground. how did you run your RCA's? what kind of RCA's are you running? are they directional? are you getting engine whine that goes according to your RPM or is it popping noises?


btw, try to keep your ground as short as possible. 2 feet is pretty damn long. most of those places you mentioned are potentially good grounds. i usually scrap the paint off the floor and drill into it. just make sure its not the fuel tank you're drilling into. Good luck!!! :thumbup: