Was on my way to the Hog dealer. The GPS (2014 triglide) went blank. They took me right in and checked the bike, said my battery was low (it was only 18 months old). Dealer asked if I was charging it after every ride like the manual says. So much electronics that it has to be constantly charged. Could this be your problem?
My trike is always on a tender if I am not riding it. This was definitely a sticking switch. I am going to get it replaced as soon as I can get an appointment.
For what it's worth, the tender charger goes through the main 50 Amp fuse under the left cover (on the 14s+ at least.) So if your charger says it's working, the fuse is OK.
The security system must be quite a draw, mine doesn't like not being charged all the time, either.