If they failed at the same time I think you may be onto something. I'd start at the switch, does it work, is there 12v there? If those check out I'd next pull the fixtures to check connections and presence of 12v.
If one light died on Monday and the next on Tue I'd suspect failed LED fixtures, test with a 12v source.
Let us know what you find.
Also, since it's a '15, is it still in warranty? There was a recent post on "if you want it done right..." Which I align with 110%.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
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