do not replace anything yet ! first check the electrical system . disconnect the negative cable , ) y$ C/ ]. R" X/ R4 [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 , ) L; u9 f g, P/ P' O# [now you know in which that device is draining the battery .