here is an easy test for the trailer side. If you jumper the top 2 pins on the 7 way round connector for the trailer with it plugged in to 110v, the running lights should come on. If no lights that way, the the issue is on the trailer side.
Ford has a separate fuse for the running lights on the trailer in the fuse box under the hood. I don;t remember the size on either of my trucks except it was a maxi fuse. !5 amp I believe.
Mike
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2006 F350 CC Dually 6.0 Powerstroke "the marshmallow"
2017 Montana 3710FL
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