do not replace anything yet ! first check the electrical system . disconnect the negative cable ,5 m1 I3 B& V2 \% X' i: e
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 ,* J* U |# A# t, `1 `) C8 Y% x7 ~- R
now you know in which that device is draining the battery .