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Didn't you verify you had a coach battery problem from another thread?
The cameras are likely connected to the coach battery. Prior to around 2013, Thor connected the stereo system to the engine battery, but in later years, started connecting them to the coach battery.
So assuming the cameras are connected like the stereo, if they work with the disconnect switch in the ON position, that means they are probably getting power from the engine alternator with the engine running - as in many Thor coaches, the engine alternator charges the coach battery.
You may have a bad coach battery.
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