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I just bought a used 2016 GC that has a factory tow package installed. The trailer running lights do not work. Is it possible it’s just not activated? I checked the fuse and it seems fine
 

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If it has the factory tow package installed, then everything should be activated. Do you have the stock 4pin/7pin plug in the bumper?
Is it all lights or just the running lights? Is it any trailer connected or just one trailer? Get one of these from Harbor Freight (or Amazon or your favorite Auto Parts purveyor) to test the wiring in the GC. Four-Way Trailer Light Tester
 
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