Are your running lights on? The camera is probably wired to a clearance light on the trailer so to get the video signal, your TV has to be plugged in (7-way plug) to your TT and your TV's headlights need to be on (not just auto, but in the on position).
I did just that last night in my humble attempt at trouble shooting and it worked. Headlights/running lights must be on. I won't forget that for awhile.
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