do not replace anything yet ! first check the electrical system . disconnect the negative cable ,1 U z- u& ^$ N
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 ,1 y% M/ r8 W2 q% q, ?
now you know in which that device is draining the battery .