[SteveC7010]

Originally Posted by Mrw

I did not check that and that would explain the random nature of the problem but if that was the case wouldn't you expect that the entire electrical system would be affected not just a specific circuit?

If there is a loose connection between the power post and the breaker box in your rig, you'd have system wide intermittent outages. But you don't.

The occasional outages being on one particular circuit suggests either a bad component or a loose connection. Circuit breakers can fail, but it's very unusual. The same for the GFCI fixture. I'd zero in on loose connections first starting at the GFCI. Be sure the breaker is off, or better yet shut down the main breaker. Pull the GICI from the wall and check the connections. As Canonman said, the stab connections are always suspect in any environment where there is motion. The screw terminal connections are much more reliable, but they do need to be tight enough not to work loose over time. If that doesn't solve the problem, it's possible that there is a loose connection in the breaker box. Not everyone is comfortable pulling the cover off a breaker box, but it's not particularly difficult if the shore line is disconnected and the main breaker is off. Once the cover is off, a few seconds with a screw driver will verify the tightness of the connections in there.

The AC side of your electrical system is pretty much identical to a residential system. The components are all pretty much the same but the major difference is that RV's don't require wall boxes in most cases. (The breaker box is physically a little different, but not electrically. It's just smaller and part of the larger power center assembly.) So when you remove the cover plate and pull the mounting screws, the outlet or switch and some folded up wire are right there. They usually wrap some electrical tape around the fixture to prevent accidental shorts.

Unless there is a broken wire somewhere, loose connections are almost certainly the primary cause of the failure you are having.