I have a 2004 Sunseeker 3100 LE. When I use the battery disconnect, it seems to work, as all of the powered items seem to 'go dark.' However, when I come back to the unit a few weeks later and flip the switch to reconnect the power---the batteries are dead. Oddly, if I leave the disconnect switch off....it seems that the batteries actually stay charged longer before draining. Obviously there is some sort of parasitic draw somewhere. Any ideas? Could it be the battery disconnect relay that is back by the battery tray under the unit? Any ideas are appreciated.