As stated in all the other replies all vet owners will have this problem . I had this problem a year ago and it would drainthe battery at odd times ( sometimes overnight, sometimes a week) After many hours and lots of help I found the problem by accident, when I parked the car in the garage I always waited to check the delay lights went out (they did) but a I noticed a slim glemmer of light!!!!! my glove box light did not shut off all the time. Good luck

Another place to look is at the clock. If the original type clock does not work, it could be using power continuously. These clocks take a pulse of electricity occasionally to wind them. If frozen, that pulse is constant. That’s what would drain my 77 if not driven for 5~6 days.

Does your security system work? If not,then you have a open circuit in your system. If you don't need the security system, on the drivers side, remove the console carpet panel and you will see the alarm relay just in front of the shifter. Disconnect the relay and that should eliminate your power drain.(Corvette Fever,Mar.2004 page 84)