do not replace anything yet ! first check the electrical system . disconnect the negative cable ,! w8 H" g, W& B+ `* h# Q$ r4 A. q
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 , 8 l3 j( U2 M$ W( X, C% `now you know in which that device is draining the battery .