Electrical Problem?

[ramzb]

Someone out there must be able to help pleeeese!!!
If I leave my fully charged battery connected, by the next morning it's completely dead, I've checked all the obvious things like lights etc, there is no alarm or i.c.e. fitted at moment as car is still in process of being rebuilt. But it is becoming a pain in the arse having to connect and disconnect the battery every time. Anyone got any idea what the problem could be?