fuse for sterio

hey i had to change my battery yesterday and osmething happened and i blew the main fuse but i replaced it and got my truck to run again, but now my sterio wont turn on at all, and i cant find the fuse for the sterio, just wondering if anyone else had this problem and where the fuse for the accesories is, thanks

should be a 20 amp fuse in the little box on the drivers side down and to the left of the steering wheel