2003 kenworth no turn signal

I have a weird one

driving down the road noticed my turn signal blinkers stopped working, no blinker light on the dash, trailer or truck, 4 way doesn’t work as well.
then it would start working normally then stop working, it kept doing that all day yesterday and then today it just stopped working any ideas of where I should start

2003 kenworth w900

 

I am heading to kenworth I will start by changing the switch first, I don’t know if there’s a relay because I don’t see one on the fuse panel

 

Does anyone know where that flasher is located
It’s not on the fuse panel

 

So I got to the KW dealer changed out my turn signal switch and flasher. Hope it does the job.

 

So once I stop at the dealer the turn signal started working randomly, after changing those two parts and I started heading down the road the turn signal stopped working again

now I am clueless