do not replace anything yet ! first check the electrical system . disconnect the negative cable , / H. x) W$ m: N. F& w6 j$ mconnect 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 , . a4 w0 v6 n& J" z1 W0 k8 mnow you know in which that device is draining the battery .