challenger

Back in the day they had the dash lights in with the tail lights so if your dash lights were out you usually knew that your tail lights were out , that was just a way to know but i would just replace all the fuses anyway if they are old it never hurts and they are cheap versus a ticket but if there is a fuse for the dash lights chances are it is bad but also there might be a inline fuse , still if nothing i would just do the old trick and plant a wire on the neg; side of batt; and run it to your tail light bulb and put it in between the side of the bulb and the casing and you will have a good ground ( just one way to rule out grounding ) hope it will help you but my guess is its a fuse