I had a heck of a time finding the fuse box or location of the fuse for the radio on my older Harley (1988 Electra Glide Classic) even after searching the Internet I got mixed info. I removed the seat, both side covers and the headlight nacelle but never figured it out. Finally I went back into the headlight. Three small screws (Phillips) later is was off and I could see two inline fuses, one Ina red wire, the other on a yellow. I opened the yellow, just guessing,and found a blown 5A glass fuse. Replaced it. Music and lights where I had none. There ya go.
Thought I'd post it to help anyone else that is looking for that fuse to fix a dead radio. Good luck and hope this helps someone.