Having trailer issues, but not sure how to resolve.

[labjr1]

Many of the LED taillights on trailers do not draw enough current to satisfy the "lights out" sensors built into the Ford. There are several manufacturers out there that make these (some are much smaller than the link below): https://www.etrailer.com/Custom-Fit-Vehicle-Wiring/CURT/C57003.html. They add resistors inline to satisfy the expectations of the truck.

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[powerboatr]

All the above. Grounds, wiring connections . Boat wiring takes a beating.
Take the time. One wire at a time.
7 round socket ,

I spent better part of week .. hair will be pulled out?