Help with reason for dead battery

I have a 2000 jeep grand cherokee larado. The battery as been as been going dead for past week. I drove to advance to buy new battery but the tech checked battery & alternator & said they where fine. I have battery recharged then it done it again 2 days later. It will start if it sits no longer than 12 hrs. Ive had trouble with door lock switches & had to take bacl panel off of trunk in which I broke a connector off the defroster. Could this be it ? & also the under hood light had been staying on. I took the light off. Do I need to unhook fuse? Pls help !