2003 Fleetwood Flair Radio Fuse?

My son turned the volume for the radio on the dash all the way up while the coach was off. When I started it up, the radio was full blast then shut off. There is no fuse on the back of the radio like I thought there would be. I found a fuse diagram for both the block under the dash and under the hood, but don't see anything about a fuse for the radio. Any ideas?