A test light will help you trace down this problem. Usually I always recommend meters but a test light is much easier to work with for the battery drain problem. It sounds like your ignition portion of the electrical circuit or accessory circuit is staying active after the key is removed. I would suspect the column key switch or some modification to the electrical wiring by a previous owner. I would be surprised if the leak would cause this issue because water does conduct, but it's a great conductor. To start tracing your issue you need to disconnect the battery and have the vehicle like you leave it at night. Place one side of the test light on your disconnected battery wire, and the other on the battery post. (Lights have no polarity so it doesn't matter which side goes on the post.) This will complete the connection and if you have electricity flowing through it, the light will illuminate.
Next I would take fuses from the fuse box, taking note of what goes where so you can replace them. Keep removing fuses until the light goes out. This should put a direction to your search. If you can find a place to disconnect it, you might try unplugging the column key switch to verify that it is turning off when the key is able to come out.
Wednesday, January 23rd, 2008 AT 11:20 PM