Quote Originally Posted by h20boy22 View Post
I do have two batteries and all amps and the stereo are feeding off the same battery. I have confirmed the noise is present on both the aux in and cd source. I have also connected my MP3 directly to amps via RCAs and the noise went away. This means it is something between the head unit and amps, correct? The problem is I can't figure out what to check/change next. The head unit is grounded directly to one of the amps.
Ok, so the noise is present through both amp and each amp is fed by is own RCA cable from different outputs on the head-unit. Just about narrows it down to the head-unit. Try disconnecting the RCA from each amp one at a time and see if the noise is still present through the other amp. Next would be to trying another set of RCA cables just laid across from the head-unit to the amps.