Thought that I'd come back to tell the rest of the story.
Doing more troubleshooting, I disconnected the feed from the RV camera from the switch box and hooked the right side camera to that input. When switched to the rear camera, the right side camera came up on the screen.
I hooked the RV feed to the right side camera connection on the switch and it displayed, no video signal.
So the problem was either the cable for the RV camera or the camera. I ordered a new camera from RVS with 60+ feet of new cable.
It was the camera. New camera works like a new camera.
What was strange is the old camera worked great backing into my site at a state park. Spent three days and the camera was dead when it came time to leave.
2017 Thor ACE 27.2