Low Beams Won't Work

Coming home last night from work, I stopped off to get gas and shut it down. When I started her up again, the low beams did not work, but the high beams and signal flasher did. I checked the fuses, and they are all good. Any suggestions on what it might be?

I run a 2002 7.3L diesel, 140k miles, Super Duty, 4WD.

Thanks for any suggestions.