my buddie was on his way to work when he came to a stoplight and it died on him, he has subs and plays them loud and the wire is 6g but should be 4 he got it yowed to his house and his dad looked at it then drove it and said it was fine. He disconnected subs so he could drive it but when he turns the deck up the car still dies, what could be the problem? and its a oldsmobile 88 not sure the year