I had this exact same issue on my Gulfstream Sunvoyager RV. The weldex system used to work fine, then a few years ago the image would come on, then slowly fade to a white/gray screen. The sound still worked though. Over the weekend I decided to troubleshoot what the issue could be. I removed the rear camera and connected directly to the monitor, and it still only displayed a white/gray screen. I thought the camera was probably dead, and just when I went to unplug it, I jostled the cable and got an image for a second or two! Upon seeing that, I grabbed the connector and started pushing, pulling, twisting, etc, and was able to get the picture again! I then determined that the connector on the camera must be bad, so i cut it off on both the camera and the connection coming out of the back of the coach and hardwired the 4 wires to each other, taped them up good and reinstalled the camera. All is working properly now!
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