Failure of the monitor to sync with the camera always comes back to powering the unit. Depending on the vehicle you're towing with you could have PWM wiring, which sends a pulsing voltage instead of constant voltage and can cause pairing issues. It's not unheard of that it will just randomly work with no issues and then go back to giving you issues.
This can be solved by installing the # VGR64VR to provide constant voltage to the camera. This adapter will splice in behind your rear camera... view full answer...
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