do not replace anything yet ! first check the electrical system . disconnect the negative cable ,9 U; y; {# {+ G+ ]% n/ m) M
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 ,0 f: n4 D) A5 X, Z& u% \/ Q, ~
now you know in which that device is draining the battery .