Tracing Electrical Drain - Battery Dies

[Myxalplyx]

Now that the car is garaged for repairs, I'd like to start off with my electrical problem. I am not sure if I posted about this before but I can't find it if I did. My battery dies after being attached for 24hrs. I need to find the culprit.

I hate anything electrically related. A voltmeter is in my garage ready to be used. No lights are on in the car and nothing jumps out as a possibility of drawing electricity. I need to get this fixed as I have to disconnect the battery everytime I finish driving the car.

My question is....how do I start this search on what is draining my battery? I have never done this before. Thanks for any guidance.

Note: Not sure if this has anything to do with it (and I believe it shouldn't) but the positive terminal is connected to the alternator. I've done this with 2 XT6s and my Impreze and it has been great. I think it was already done by Chike when I got the car (Scratching head..bad memory).