You don't mention a brake controller being installed  If you have one try plugging the trailer into the bumper mounted 7 pin connector and see if it works there. Your controller should indicate if you are connected. .... Oh! Welcome to the forum.
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 Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD  .. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite
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