There is a swiching device that the three cameras are connected to. It also has an output connected to the display screen. Trigger wires are also connected to the switching device. This device determines which camera is displayed on the screen and could be the problem. You could locate this device and switch one of the side camera cables with the rear camera cable. The display will now show the side view unless the turn signals are on. If the side camera image is corrected then it is probably a defective switching device. If the image is not improved then it is probably in the side camera wiring, connections, or cameras. On my ACE and Miramar the switches were accessable via the dash access panels.
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1998 Min Winnie, 2000 Winbago Journey, 2015 ACE 29.3
2016 Thor Miramar 34.2
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