Bad to use power/gnd wires on OEM harness?
I recently purchased a harness adapter for my Hyundai Accent. The aftermarket harness adapter uses the same wire thickness (~16ga I think) as the stock radio plug. The speaker and power wires go into the bowels of the car as one big bundle.
Is it bad that the signal and power wires are together? Using better wire or routing power wires far away is pointless if they will eventually be in one bundle anyway. Plus, I can't rewire that whole area easily.
My specific question is:
Is it OK if I use the stock radio harness, but ground it close to the amp? Right now I am using both the 12v and ground wires from the harness, so the ground wire is pretty long. I have alternator whine. Will grounding the amp with a very short wire fix the whine? Will I have to install a separate 12v wire and ignore the 12v wire on the harness?