do not replace anything yet ! first check the electrical system . disconnect the negative cable ,8 C" `5 Z0 y% z5 \3 q' h" Z
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 ,! u: V8 D. ?0 O) Y5 U* L
now you know in which that device is draining the battery .