How do I change my headlight bulb for my 2003 expedition headlight?

To change the headlight bulb on your 2003 Ford Expedition, first, disconnect the negative battery terminal for safety. Open the hood and locate the headlight assembly; remove the retaining clips or screws to access the bulb. Twist the bulb socket counterclockwise to release it, then pull out the old bulb and replace it with a new one, ensuring not to touch the glass part. Reassemble the headlight assembly, reconnect the battery, and test the new bulb.