I have a 2016 Newmar ventana. I do not like the side cameras and prefer to see the towed vehicle when making a turn. Is there a way to disable the side cameras without pulling wires from the back? ...
I don't know how others are set up but mine is very simple.
All three camera RCA cables connect to a switch box. The turn signals are wired to that control box. There is one RCA output which connects to my display screen. With no turn signal on the rear camera signal is sent to the display. Each turn signal will switch the output as expected.
I disconnected the rear camera input from the switch and ran it directly to the display input.