I have been having problems with my taillights on my 84 for a while. I directly wired the harnesses together in the back of the car and my problems went away. The problem that im having now is different from what i was having before in that before i directly wired them i didnt have taillights, brake lights, or turn signals. Now i do not have tail lights, but i do have the others? Could this be a ground problem? I did switch out theroller switch and the headlight switch as well. I visually checked the bulbs and they look fine. Any help would be great!