do not replace anything yet ! first check the electrical system . disconnect the negative cable , 7 e3 y% P- Q! s q) gconnect a test light between cable and battery post . if the test light lights up bright , there could be a short circuit somewhere . pull out each fuse to see until the test light goes dim , 3 c& d: y, s t& N& }now you know in which that device is draining the battery .