turn signal issues. 2022 pete 579 next gen

Is there "blinking" power at the end of the problem lights pigtail?

 

What happens when you turn your running lights on? Maybe a wire got crossed there.

Let me know. Need more details.

Start at the tractor side 7-way and see if the terminal is blinking with a test light. If it is, follow it back until you find the problem. If it's not, burn the truck: everything is computer controlled. Just kidding.

If any of the lights are blinking on the trailer, run a jumper wire to the problem light and snip the original power source.

It could just be the bulb, or a flasher relay behind the dash.

 

I know you said you checked the fuses, but take a look at the 25 AMP fuse labeled N2 SCM 5. It's at the bottom left corner engine side fuse box.

Let us know what you find.

Regards