How do you replace a headlight bulb on 2000 Ford F-350?

To replace the headlight bulb on a 2000 Ford F-350, first, open the hood and locate the headlight assembly. Remove the retaining clip or screws holding the assembly in place, then gently pull the assembly out. Disconnect the wiring harness from the back of the bulb, twist the old bulb counterclockwise to remove it, and replace it with a new bulb. Finally, reassemble the headlight assembly, reconnect the wiring harness, and test the new bulb to ensure it works.