From a previous thread
"If your system has only a single rear camera, you can move the BLUE Trigger wire from the Reverse circuit to the +12V Ignition/Accessory circuit. This will cause the camera to come ON automatically whenever you start the coach and shut off when your ignition is OFF. The monitor will remain in the CAM1 position when triggered, so this would not be desirable if you have a second camera in your system.
Most of our newer Voyager Observation monitors have either an Auto-ON or Last Position Memory function, which would provide this method of allowing the monitor to turn ON with the ignition while still allowing triggered operation by the Reverse & Turn-signal circuits."
Also has a Tech. - Help Info
Voyager Monitor A0M681 questions