I think most are wired so the camera is on when the running lights are on, and I don't think there is a fuse anywhere specifically for the camera. I'm not sure how you took a voltmeter reading in such a small connector. I could not get my voltmeter probes inside the connector on my trailer.
As far as a wiring diagram for your trailer, they are not available.
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2013 Silverado 2500HD LTZ CC 6.6L Duramax Diesel
2023 Rockwood 2445WS
Buster, miniature Dachshund
2023: 6 trips, 37 nights in 10 states, 2 provinces 6077 miles
2022: 3 trips, 18 nights in 4 states, 2352 miles
2019: 7 trips, 43 nights in 6 states, 5336 miles
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