Some other electrical thieves include the overhead interior light, glovebox light, clock, etc.

To test, hook up the volt meter between the possitive battery post and the positive baatery lead. if there is voltage present, you have some kind of drain.

To isolate it, remove #1 fuse, then read the meter. Replace #1 fuse, remove #2, etc. in turn until the meter shows no votage drain. That's your circuit. now, just narrow down which load on that circuit is faulty.