Why are my turn signals not working?

1974 Plymouth Satellite Custom 4-door. Turn signals up and stopped working (All four of them at the same time). Hazard flashers still work mint. But when I click over to turn signals (Left or right) nothing happens (Inside or out of the car). I have changed all the fuses in the fuse block (just to be safe) and have tried a NOS AND aftermarket turn signal switch to no avail. Still have hazards but no turn signals. What am I missing? Where should I look next anyone have a similar problem in the past? Thanks!