I use cigarette lighter for cell phone charger. Blew the fuse...can’t locate. Blew fuse for radio and found that in drivers side front compartment. I have 2004 Ultra Supreme, triple slide.
If you have a Ford engine (you did not say or the year) try the engine compartment. A small fuse box may be found directly behind the filter box. hard to see and a pain to open but it's there on my unit. 2007 class a Sun voyager.
Jim Benzie