Turn signals and clearance on trailer not working

Guys

so in the Chicago area and winter with salt sucks. Truck was having issues where the right turn signal was staying on (not flashing) when the lights turned on then when you would turn all lights off and turn on the right turn signal both would flash L&R. The right one would flash by itself when turn on and 4 ways would work also. Now I have no turn signals at all running lights on or off. I have power at the fuse panel when checking with a test light. Also now I have no clearance lights on the trailer. My trailer has the 3 taillights on each side and 3 smaller marker lights in the middle. So the middle 3 marker lights are not working along with the outside clearance/turn signal lights as well. There is no power to that plug on my trailer pigtail. Problem is isolated to the truck but don’t know what it could be

any suggestions? Could it be the flasher relay? Turn signal lever/switch itself although not sure that would affect power to the trailer marker/clearance lights.
It’s driving me crazy please help if you can.
Thanks Nick

 

Yes a test light. No power to the turn signals nor the marker. Twilights and brake lights show power. The issue is definitely at the tractor someplace.
I did find the little hose for the windshield washer sprayer is broke at the plastic piece the hose slides into on the drivers side so washer fluid was spraying inside the dash there when driver used it. Obviously he wasn’t aware of what was going on behind the dash

 

I have. That’s fine. It’s a 2002 Peterbilt 379 day cab

 

Correct. The problem isn’t in the cord.

 

Thank you Lamoverit but I’m looking for suggestion on where the issue may be. Ex… relay, fuse, flasher, etc. I’m sure I’m not the first one to deal with no turn signals on my tractor/trailer and market lights in trailer. It’s the first time I’ve encountered this problem.