Power Window Fuse Overheating / Windows Don't Work?

I have a 1993 Jeep Grand Cherokee. Yesterday all my power windows stopped working. I pulled out the 30 amp fuse and put it back in and they worked for a short time. Now any time I put the fuse in, it instantly gets scorching hot (too hot to touch) I checked every other fuse and they are all fine. What could be the problem? Could there be a short somewhere? I have a tester but I don't know what wire to check. I'd rather not take it to the dealership because the price is outrageous. Any suggestions would be very helpful so I don't get robbed. Thanks!