Not sure about the Windsport configuration for the tail lights. If both lights on each side perform the same functions then more than likely it is a switch problem. If, however, one light on each side is used for brake lights while the other is turn signals it could be a wiring issue.
Did the brake lights work during the PDI? If so it could be a loose wire or ground connection.
Don't waste your time going to a Ford dealer since they did not install the lights they will more than likely tell you it is a Thor issue unless the problem can be tracked back to the switch or Ford installed F53 light wiring harness.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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