I got it! I did as you said, squeak. I disconnected the RCA ground, and the that didn't change it, so when I disconnected the HU, the little spade plug for the ground fell out of the plastic main plug. I don't think it was ever making contact. Plugged it back in and all works fine. Thanks...
I just finished installing the door and rear deck speakers and the sub. I have 4 ga. power and ground running to a MTX 4405. The ground is bolted to a bare metal surface under the seat. The problem is, when the key is turned to acc. everything is fine, when you start the car, you get a nasty...