I would first follow Scooter's advice and call RV Cams. A phone call is quick and virtually free. They are good. Tim is good. Their number is (225) 261-9946.
On our '06 Dynasty, the connector at the monitor and the connector at the camera were NOT the same. I wound up with a camera change with a new one from RV Cams, and they provided all the info to put a new connector on both ends of the cable to use the existing monitor and cable with the new cam. Love the new one! Far better than the original.
An owners manual that Tim might be able to lead you to, would be a great troubleshooting aid. Good luck to you!
Jim & Angie, Boise, ID
2006 Monaco Dynasty Countess III
2017 GMC Acadia Denali