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Why would the running board lights on a 97 Ford Expedition not light up if bulbs and fuses are fine?

There are a few possible reasons why the running board lights on a 97 Ford Expedition would not light up even though the bulbs and fuses are fine:

- 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.