[Drivesthebeast]

I think that what you are hearing is feedback from the deck, which is being created by a short to the ground. More than likely the ground in, or to the head unit. The amp is merely doing what it's supposed to do...amplify whatever is sent at it, including noise. Have a look to see if any of the wires are pinched or exposed in behind the deck, including the antenna cable. It's quite possible that you damaged an internal ground in the HU too while hooking everything back up (don't feel bad if this is the case, I did that with a Premeir HU a long time ago and had to have the IC's inside of it replaced 2x before the deck operated 100% again).