ok so I have a 99 grand prix when I bought it had a stock head unit and I belive the rear speakers worked fine for the week I had them in there. Anyways I swapped it out for my aftermarket jvc head unit and after that. It seemed my rear speakers cut in and out and only worked at random times and probably less then half the time the stereos running. So I've been figering it was bad wiring as it looked like a chop job from that last person that owned the car. But today I wired directly to the head unit to rear speakers to see if that was the issue. And I got nothing out of either one. So im completely clueless to what the problem is here. Maybe new speakers? I really need some help would be aprriated for very much sick of listening to only the front speakers