Got my brand new Pioneer DEH-X3800UI head unit, grab my self a new wiring harness cause the old one was crappy plus I got itr for 2 bucks. Anyways everything is plugged in the right place the speakers work but only the LEFT side of my cars speakers work that means front left and rear left. I've tried to balance it all on the right side and I can only hear a feint sound coming from the speakers. Im sure people have had this problem before. Can anyone please give me some insight/advice?