I have a 2013 F250. Make sure you have the front and back switchback blinker lights installed when you do the mirror lights otherwise you may notice a polarity interruption. Once all
the blinker lights are installed, the mirror lights will work properly. If you have a truck that’s a few years old, the O-ring around the mirror light plug may crumble. A major online store sells them, 6x12x3mm. Have these on hand first or the light plug will rattle and may not be weather protected. I used two on each plug and it worked great. The mirror lights are very easy to install. I have since switched all my lights to dieselleds and absolutely love them. Great customer service too.