Might be the alternator! how manny watts you runin and what kind of car? Nvm I see you have 550 watts and a 93 vigor.... well im not sure what kind of volt rating your alternating current generator produces. But it sounds to me like the system is getting all the juce! look, the battery plays a 550 watt stereo... but it cant start your car! whats wrong with this picture? There are two possibilities... 1 you need a new starter.... 2 the alternator is barley makin enough power to suport the motor and system so the battery is plain not recharging! so if you stop and play the system then it "eats" all the battery power. So when you try and start your car there is no juce left! get it? :thumbup: