I had a similar problem on a recent trip. Two idiot lights came on - check engine and coolant temperature. Coolant level was fine. Cooling system fuse (10A) looked good. No codes were thrown. That last item indicated (to me) that thermostat, cooling pump, and fans had not faulted. Led me back to fuse. I replaced the fuse and problem went away.
FYI, in the process of diagnosis, I spoke with a service advisor at Grand Junction H-D (one of three dealers who were all 150-miles away). He agreed with the diagnostic steps I had taken. He advised that if the new fuse didn’t fix the problem, simply disconnect the electrical connection to the cooling pump and just ride it in for service. He stated the the wet head is really only cooling the exhaust manifold and no further damage would occur as long as I didn’t join a parade.