I have a 1997 7.3 450 and my turn signals recently stopped working. I changed the turn signal switch and that didn't fix it. Checked
Fuses, the wipers work, brake lights work, hazard lights work but just not the turn signals!

 

Check the flasher relay in the in cab fuse panel. It is the round thing about the size of a quarter.

 

Wouldn't the flashers not work if that was bad ?

 

No, flasher relay is behind the fuse panel.

 

To clarify, the turn signal flasher is on the side of the fuse panel you can see. The hazard flasher is on the "blind" side of the panel. Nice situation for testing if you don't have a spare. You simply switch them with one another. If the problem "moves" to the hazards, then that indicates a bad flasher. If not, the problem is elsewhere (switch, wiring, etc).

(And neither one is a relay.....)