MY GTI 99 IS HAVING PROBLEMS STARTING.. THEN WHEN I JUMP START IT IT STARTS RIGHT AWAY. BUT THEN WHEN I LEAVE IT OVER NIGHT THE NEXT DAY I TRY TO TURN IT ON ITWONT START AGAIN WHAT COULD IT BE BECAUSE WHEN I TRY TO START IT AND IT WONT THE MIRRORS MOVE, SO COULD IT BE THE BATTERY OR ALTERNATOR?