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Well I'm embarrassed it was just the bulbs that burnt out....
When I went to O'Riley's I asked for some new rear running light bulbs and was told the rear is all LED and it's not going to be that easy. Turns out they were wrong.... Regardless, I'm glad it was an easy fix.
Hey All. I just purchased a 2021 2500 Cummins Big Horn from a dealer in Boise w/ 65k miles. I got it home... about 3 weeks later, I noticed that both the rear nighttime running lights don't work. And neither does the driver's side rear brake light. Reverse lights and turn signals work fine on...