do not replace anything yet ! first check the electrical system . disconnect the negative cable ,. y, g6 a' p7 u' {) U( ]+ B
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 , , r/ J* q* @ a5 K( h; {now you know in which that device is draining the battery .