do not replace anything yet ! first check the electrical system . disconnect the negative cable ,* x$ ^) \ u& [6 n. b% Y. t7 Q& Y
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 , : N) R4 Y& S( K$ a" z- X8 t( vnow you know in which that device is draining the battery .