I have been attempting to install a new head unit in my 2004 bonneville and have run into a lot of troubles. First the thing won't turn on then I find out the the red ignition wire from the car doesn't work so I wired a switch. I finally got it to turn on, now none of the speakers play. Some shop owners and best buy people told me that I have to have a remote wire to the factory amp or to buy a $150 harness that has everything. I looked and can't find an amp. Does anyone know where it is(if it has one)? Or how I could fix this problem?