Fuse blowing during tow

[Dragline]

My 15amp rear bedroom fuse started blowing while in tow, I Replaced the ac control board before leaving which I think the thermostat receives its power from and of course it’s dead as well until I replace the fuse and everything is fine I’ve wiggled wires checked the harness where I can reach and locate behind panels, just wondering if anyone has had this issue before or how can I locate the problem.