- Wiring issue: There may be a problem with the wiring that supplies power to the running board lights. This could include loose or damaged wires, or a faulty switch.
- Ground issue: The running board lights may not be properly grounded. This could prevent them from receiving the necessary power.
- Corroded bulb sockets: Over time, the bulb sockets in the running board lights can become corroded, which can prevent the bulbs from making good contact and staying secure in the bulb socket.
- Module Issue: Some vehicles have daytime running lights that are controlled by a module and they may need to be enabled if the running lights themselves do not work.