Ford uses a Bargmann 7 pin connector, Keystone uses a "generic" Pollak connector. Sometimes (not always) the pins don't match well and there will be a "jittery" connection. When that happens, the truck computer detects the "loss of trailer signal" and tells the dash display/trailer brake controller that there is an error. The computer diagnoses the error as "trailer disconnected" or "trailer wiring error".
Clean the connectors on both the truck and the trailer, apply a liberal (huge) coating of di-electric grease to both. If that doesn't fix the problem (it probably will) then get a new "BARGMANN" 7 pin umbilical harness and replace the wire/connector on your trailer so it matches your truck.
You can buy a Bargmann 7 pin connector, cut the end off your trailer and install it, but I've found that replacing the entire umbilical causes less potential problems when the chips are down and you really need it all to work properly.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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