On my trailer, the power is run from the center running light. If yours is the same, check to make sure your running light near the camera is on. If it is and you still have no power to the camera, pull that light and see if the connection is made or take the connection apart at the power plug to make sure it is wired right.
Sorry, all the posts did not load on my pc until after I posted. Glad you found it.
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