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Troubleshooting
WL
Since ALL of the lights work fine on the camper it's pretty safe to say there's nothing wrong with the truck and its wiring, I believe the problem is with the jet ski trailer.
Hook up the jet ski trailer to another truck to make sure the problem isn't there (if you haven't done this already).
Are you using the 7 pin connector for the camper and the 7 to 4 pin adapter for the trailer? If you are (and the trailer checks ok on another truck) the problem might be in the adapter itself.
BTW, welcome to F150online.
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