Turn signal wiring diagrams please?

I have the XLT model. My problem is that my turn signals do not turn on. I have checked and replaced the fuses in cab fuse box and in the engine fuse box. I also replaced the flasher fuse, all blinker bulbs front and back and all blinker bulb sockets from dealership. Also replaced the multi blinker switch with new one. All lights work but my turn signals still do not turn on still, even though I replaced everything with new parts
So wondering what could be my problem(s)?
could it be wiring problem?