[Caver]

Intermittent electrical problems can be difficult to find. Be patient and try to figure out the wiring and isolate the problem. It's usually simple once you find the specific problem. There is a junction behind the refrigerator where the battery wire connects to everything else. Both positive and negative have large wire nuts to create the junction. Check this carefully since there could be a poor electrical connection.

Tapping on fuses shouldn't fix anything. Fuses are designed so that once they have blown they will stay that way. I would be suspect of any circuit breakers that may be part of the vehicle power to the rear connector. I have two of these. There is one for the trailer and the other to the Prodigy brake controller. These are thermal devices and if the current is exceeded they open for a while and then close again.

I hope you find the problem without too much work. Ray