Quote Originally Posted by matt5112 View Post
actually its a ghetto solution to a retarded problem that shouldnt exist..........

I think I agree.

The shields on the RCA plugs in your head unit should be grounded inside the head unit itself. If you don't think that the ground you used hooking the unit up to the OEM harness isn't enough, then run a dedicated ground from the head unit case to the chassis...if you're really anal, run it to the battery negative terminal.

12 gauge wire is overkill...18 gauge will do ya. I'm talking about your average 50 watt per channel head unit. If you're talking about a head throbbing amp, Ohm's law and a wiring capacity chart...both readily available on the 'net...is your friend.

Ground loop isolators should be able to clean up minor alternator whine and some ignition popping. If it doesn't then you'll need to go to the source. Alternator whine is most likely failing or dead diodes in the alternator. Ignition pop can be traced back to the wires or the plugs.