do not replace anything yet ! first check the electrical system . disconnect the negative cable , O; k, L$ L* C% S6 V5 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 ,! Q. J$ O- h) Z- p0 Y
now you know in which that device is draining the battery .