@karter44 , thanks for this post. I had the same issue. Very helpful. I just swapped the bed lights and they worked. They are marked R and L, too. Same issue, I had Line-X installed and the lights were put back incorrectly. Also, the technician broke a tab on one of the lights.I figured out the problem was when they did the bedliner they put the lights in on the wrong sides. I would not think it makes a difference but it does. As soon as I put them in the right side they worked.