Fuse
Check the brake switch at the pedal.
either dimmer switch or blown fuse If you are saying that the tail brake lights are working but the third brake light is not....It may be a defective turn signal switch in the steering column.
Tail lights. Brake lights. Backup lights. Signal lights. License plate lights.
Maybe it is not connected properly or you bought the wrong type of bulb.
If your trailer brake and signal lights only malfunction when the tail lights are on, it could be due to a grounding issue or a short circuit in the wiring. The tail lights may be drawing too much current or creating interference that affects the brake and signal lights. Additionally, check for corroded connections or damaged wires in the trailer's wiring harness that could cause this problem. Testing the trailer's electrical connections with a multimeter can help pinpoint the issue.
This usually means a bad or wrong bulb in the tail lights
Try checking the tail light relay.
There could be a severed connection somewhere along the line, or it could just be a blown fuse
First of all.Whats wrong with them. Second if its a turning signal or a brake light problem Third is it reverse lights Being more specific does help get more answers
The problem points to the directional/lights and hazard switch. The brake light wiring is part of that circuit.You can buy the switch after market it is about $70.00.
See sources and related links below for 1993 Dodge Shadow tail light, brake light and turn signal light bulb part numbers.
It is either a bad relay , cut wire or the wrong wattage bulb .