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Rowyco1526

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  • Name
    Brad
  • Location
    Phoenix, AZ
  • Drives
    2015 Silverado 2500HD

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  1. The third connection for brake lights is for people with a truck topper. You can run another wire to get your third brake light to work correctly on the topper. There is a service bulletin on it somewhere. https://www.gmupfitter.com/files/media/photo/920/UI Bulletin_122b.pdf
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