do not replace anything yet ! first check the electrical system . disconnect the negative cable , & l; r' N: d3 iconnect 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$ d4 s: t( h4 R1 t( znow you know in which that device is draining the battery .