The best way to deal with this so you aren't throwing darts with a blindfold on is to do a amperage draw on the battery. Not sure if this is more complicated than you are ready to deal with, but basically you get a multimeter, disconnect the positive battery cable and set your meter up for amperage reading. Put leads in series with the battery and the cable. Look for the draw. Start pulling fuses until you see what circuit it is that shuts down the parasitic draw. Than start digging into that system systematically. Hope this helps.

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Dave S.
Northeast
2003 4.6is
2005 E53 4.4
2003 E39 Msport(a REAL ONE!)
1959 Fiat 600