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Are these those plugs that are all one piece with the face plate? The ones with the wires pushed into the slots in them? Those can be troublesome and it sounds like the wiring may gotten burned inside one and won't pass the current across. In my shop I usually just remove those and add a shallow box and new duplex plug and wire them up with the screws on the sides for more secure connection. It would be rare that any of those Romex leads are damaged unless they were exposed somehow when the roof was repaired. That is what I would check and how I would repair this. Hope this proves helpful here. Please get back to me if you need more as all follow ups are included in our fee. No time limit.
Not many RVs wire up 120 VAC circuits in the ceiling for wall outlets. If these are wall outlets that would be rare, but it could have happened I suppose. Did they replace any damaged wood? If they did, they may have put a screw in the wiring, but usually there are metal plates over all these areas so that can't happen. Where are these two outlets?
If it just went through the side it may have broken just one, but you are correct about all three. I suspect that this is in a plug. They can give you a good voltage reading and even ohm out and yet fail under load. If this was in my shop, I would replace those outlets and hook up a load to the feed and test that under load.
Most all wall plugs are on a GFCI circuit. No way to really know how they wired them up, but doubtful about any J-boxes in there. I would take those two bad ones loose and put a load on them and see what the voltage is. Then go in the direction that leads for a solid reading under load.
Rig up a light bulb and just use some wire nuts to attach it to the leads. Doesn't have to be a large load.
You have to go back to what you think is the logical (so much as possible) one that supplies those. That may take a few tries to get that. If it turns out that the screw theory is correct, you have to see if you can route a new lead into those.
They are never the same way and unfortunately, Fleetwood got rid of all the wiring diagrams for these so we have to figure it out the hard way. In the shop we have to do this exactly the same way you are doing it. Having new duplex plugs that are going to be dependable is never a bad idea. What you are thinking is the "third plug" may actually be the one feeding these.
If you are not actually using the wires you may not be getting an accurate picture of what is there. If you are putting the probes in the sockets that can happen.
Just checking back in to see if you were able to resolve this or not?
That would do it. I thought we had checked all those first. Easy to overlook those sometimes. Glad you were able to get it resolved and for letting me know.
It happens.............sometimes we just overlook the obvious. Glad you were able to finally flip the switch!
You are most welcome!