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Fixed this again this weekend. It's a silly design. The rubber seal in the connecter degraded substantially and the connector keeps working loose. I picked out much of the rubber seal and packed the connector with dielectric grease, then coated the entire connector in liquid electrical tape. The underside of that trim piece was filthy (just like last time).
Ford really should've molded a lip or something into it to keep dirt and debris from accumulating beneath the trim. I was going to apply caulk to the top edge of the trim but could not find my caulk. The last repair held for a year. Hopefully this one will last the duration of my ownership.