do not replace anything yet ! first check the electrical system . disconnect the negative cable , B9 R; c: H6 j
connect 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 ,0 S+ k0 j) F% O# M, R+ \$ W, W
now you know in which that device is draining the battery .