Contour Enthusiasts Group Archives Forums General Troubleshooting Charging / baattery running down problem

I thought I had a bad batterry a few weeks ago, so I went out to get a new one. They put the old one on the tester and said it was fine and charged it back up for me. 1 week later after acting fine, it dies again on a sunday morning after sitting all saturday. Figuring it was a 2 year old battery from walmart that had gone dead twice I just bought a new one, checked that I was getting about 13.8 volts at idle from the alternator and forgot about it. Once again it ran perfect for two weeks, but after sitting all day today without going anywhere it went dead again. I jumped it with the wifes car, and checked again that once it got running it was showing 13.6 volts at idle.

I assume this rules out the alternator (unless it craps out when hot) - which I guess means something is leaking current? Any suggestions on how to check what it might be? Can I check for current draw at the fuse box with the car off to try and figure out whats going on???