Should you be unlucky enough to have the headlamp bulb in your Mercury Villager burn out, you can replace it yourself. This job doesn't require any special tools, but you'll need to get the appropriate replacement bulb before starting.
Shut off your Villager's engine and set the headlight switch to "OFF." Open the hood using the primary and auxiliary hood release latches.
Locate the back of the headlight assembly inside the engine bay.
Remove the electrical connector from the back of the broken headlight bulb with a quick rearward tug.
Turn the retaining ring counterclockwise and slide it off its plastic base. Keep the ring in your pocket or in a small bag for safekeeping.
Pull the old bulb straight out of the socket and replace it with the new one. Line up the new bulb's and the socket's grooves, and push it in until its plastic base touches the back of the socket.
Twist the retaining ring back onto the socket base and reattach the electrical connector.
Test the new bulb to make sure it works before closing the hood.
