do not replace anything yet ! first check the electrical system . disconnect the negative cable , 9 _/ U5 X# p# E+ rconnect 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 , 2 y0 B: m8 C u5 i0 Mnow you know in which that device is draining the battery .