SOUNDS LIKE YOU HAVE A PARISTIC DRAIN ON THE BATTERY.
YOU CAN DISCONNECT BATTERY CABLE AND PUT ONE END OF A TEST LIGHT TO BATTERY AND ONE SIDE TO THE CABLE YOU DISCONNECTED ...IF YOU HAVE A DRAIN THE LIGHT WILL BE ON ..........START PULLING FUSES UNTILL THE LIGHT GOES OFF AND THAT WILL BE THE DIRECTION YOU LOOK IN FOR THE DRAIN .....
BG
December 2005