ford f350 front passenger turn signal does not work. changed bulb replaced blinker round fuse thing? works on emergency flasher but not for turn signal?

Sounds like a possible wiring concern causing circuit failure. Do you have a trailer hitch wiring harness attached? If so, it's quite possible that there's a wiring issue that is disrupting the entire passenger side turn signal circuit. Seek guidance at a local shop near you for assistance. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops