I too, blew a fuse changing out my radio.
Looked all through the main fuse panel, both the Spartan one and the Newmar one. Nothing..........
Tried under the dash - no fuses there!
Was hooking up my shore power line yesterday and guess what - there is a fues box in that compartment!!!
It holds radio and other minor fuses..........STRANGE PLACE for a radio fuse........so far away from the radio or any of its wiring.........
There are about 6 or so fuses there........all minor power level things, mostly from the front of the coach. Looks like an after-thought.....