I have a Jensen dash unit with my USB cord ran into my glovebox.Ok I turn it on it plays a second or two then blinks and shows Jensen on face for a few seconds then blinks and plays stereo for a few then blinks and back to displaying Jensen.I plug in my ipod nothing it just blinks then stereo then blink then display then blinks.I have checked battery connections their tight,loosed them and cleaned them,no better.Please help I have a parade tomorrow afternoon.