It just protects the connectors on the truck side of the harnesses for the tailgate. If you open your tailgate and look at the center of the bed, you'll see where it would go.Does it cancel out a signal to a sensor or something?
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Thank you, seems obvious now, although now I should question why I never had one on my 1500 (2012) which was also new... I should have searched just didn't know what to search for!Question gets asked monthly.
It is for when you remove tailgate. You unhook the connections and that goes into them to protect them and shut off their use.
If your 1500 was a 2009 to 2019 it should have had it too