the way to find the "drain" is to go out at night and turn everything
off. clock if electric.
now go to the battery and take off a cable . then re-make the connection.
if you see a small spark , it means something is still draining juice.
go around to the fuses. and start taking one at a time out. Until the
"test" produces no spark, then you have found the circuit.
Look for shorts,etc.
and Good luck!