Hi hopefully someone can point me in the right direction. In my 73 duster the turning signals will only work if I have my headlights off and even then the back left will not work. also the on the front right running light it will only flash for the turning signal when the headlights are off but if the signal is not on then it will not turn on (I am thinking it is just a two way bulb and its just burnt out). Any help would be great and sorry if I didnt explain it very good.

 

Ran into something like on a non mopar a time or two, I'm thinking it was a headlight switch on the ford an a ground on the gm.

 

73 -

Check ALL the fuses on that circuit and ALL the bulbs manually.
Then do as Iowan suggested, tracing the wires.

Archer

 

just fixed my lights in the rear none were working it turns out someone separated the plug from the trunk to deck lid connection stupid stuff if all bulbs check good start with an ohm tester and start at the plug to ground sometimes it just isn't making contact to the body of the car.i had to change the mounting screws for the setup in one rear light for it to be grounded .anything is possible.good luck