All I can tell you is that the lights work fine in the warm weather and the left one stops working when the temperature goes below freezing. The third replacement light works on the passenger side and they are still trying to get a good one for the drivers side. I am sure nothing else is wrong with the truck they are producing faulty lights. Ford has told the dealer to keep ordering them until they get one that works. By your name I guess you are a mechanic so am I for the last 35 years.