First place to try is the back of the radio. Pull it out and look back there.
Now the 2nd place to look depends on if you have the RV Custom Products board or not--my 2nd fuse for the radio is in the box in the outside storage bay under the drivers seat.
Check Ed's manual I bet he has the fuse location in there.
http://www.thorforums.com/forums/f10...nual-4961.html