I have A 1997 dodge ram with a pioneer head unit in it. Here lately the radio has begun to shut itself off then back on on its own like it is losing power. I exchanged the radio to make sure it wasant a defect unit and that isnt the problem. When it does this it is also losing its presets so If im correct in my thinking here it would have to be losing both power sources to shut itself off and lose presets right? so maybe i have a bad ground wire? I dunno what else to check. all the wiring looks to be good I might run a new ground and see if that helps. By the way an amp wouldnt cause anything like this to happen would it?