Installed my new head unit (Pioneer MVHX560BT Digital Media Receiver) in my 95 GT and got all the wires connected, mic, usb, aux and I have a little static or white noise that is driving me crazy between songs when it's quiet. I've replaced the speakers in the back and front and I don't have an amp. Any thoughts? From my google searches it sounds like a potential ground issue but I really don't know where to start. **Played with it a bit and I only get the static/white noise when it's in BT or AUX mode. It sounds great when the radio is on.