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I drive a 2000, 7.3 diesel, F250. Both sides of my blinkers front and back quick working. All fuses look fine. Checked bulbs, they are fine. What is next to check?
Welcome to FTE gibzilla! Most likely the multifunction switch. By the way there is a forum a little farther down the main page for the F-250 and F-350 trucks. Good luck!