Flashing lights

[Towbarman]

Good noonish time
My issue is, I have a M1120A4 Light Hauling System (LHS). The issue is that the clearance and turn signal lights are flashing when the Hazard switch is on. I have already changed out the wiring on the steering wheel. That's where I thought the issue was. Nope. it's something else. Any help would be appreciated . Thanks Towbarman

 

[heymccall]

Pull one turn signal bulb at a time. The easiest place to start is a shorted bulb/ socket.

 

[Towbarman]

My mechanic told me more on the problem. Left blinker on all lights are going, clearance and turn signal lights. Turn right turn signal on no problem with lights flashing

 

[terex herder]

Sounds like a ground problem, at least thats the first place I'd look.

 

[Truck Shop]

Or if sealed beam lights a broken filament.

 

[Steve Frazier]

Do you have a trailer plug? They tend to corrode and stray voltage will cross wires through the corrosion.