I think this will work. Since #13 is the culprit, you're going to have to narrow it down to which circuit is the prob. (#13 controls a bunch of stuff.) Suggest you unplug one wire at a time at that fuse. If you've got lots of spare fuses you can blow them until you they stop blowing. Last wire pulled is probably the faulty circuit. Or you could try an amp meter reading across the fuse terminals while you're unpluging the seperate wires to that fuse.