Hazard light not working -- electrical help needed!!

I am working on a 68 Barracuda. The Hazard lights work fine except for the drivers side light. I have changed the bulb (2x) and have now come to the realization that it must be a wire for that lamp.

The lamp is the parking light, turn signal, and the flasher. The turn signal works -- so does the parking light but the flasher will not work. Is it a seperate connection?

Where should I begin to fix this problem? Any help would be appreciated.

mine had had the same sort of problem , dirt inside the switch , took mine apart & clean it , light dab of deelectrical grease , worked like new
but also check & clean all ground wires as a grounding problem can cause all sorts of odd things happening