73 dart turn signal issue

This could be a bulb or socket problem, otherwis it's in the signal switch

The hazards use the same wireing all the way up and into the switch

Carefully check that all 4 lamps flash the same brightness, and re--check with hazards on and with park/ tail lamps on. One bulb that is "acting weird" indicates a bad bulb, bad connection, or socket problem

If this is not the case, it must be in the signal switch.