I went through this same thing on our 2019 27RL.
There is no on/off switch.
What I found out, thanks to a bunch of awesome helpful members, was:
You have to be hooked up to your tow vehicle with the running lights on to power up the backup camera.
So, hook up to your trailer or get your vehicle close enough to plug in your trailer lights, turn on your running lights in your vehicle and there should be power to your backup camera wires.
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