Ford 1998 Crown Victoria Owner's Manual page 137

Maintenance and care
2. Remove the protective cover by turning the three knobs to the unlock
position.
3. Disengage the safety snap on the connector by pulling upward slightly
on the clip.
4. Release clip and disconnect the
electrical connector from the bulb.
5. Remove the bulb retaining ring by
rotating it counterclockwise (when
viewed from the rear) about 1/8
turn to free it from the bulb socket,
and slide the ring off the plastic
base. Keep the ring to retain the
new bulb.
6. With out turning, remove the old bulb from the lamp assembly by
gently pulling it straight back out of the lamp assembly.
To install the new bulb:
1. With the flat side of the new
bulb's plastic base facing upward,
insert the glass end of the bulb into
the lamp assembly. Turn the bulb
left or right to align the grooves in
the plastic base with the tabs in the
lamp assembly. When the grooves are aligned, push the bulb into the
lamp assembly until the plastic base contacts the rear of the lamp
assembly.
2. Install the bulb retaining ring over the plastic base until it contacts the
rear of the socket by rotating it clockwise until you feel a "stop."
3. Connect the electrical connector into the rear of the plastic base until
it snaps, locking it into position.
4. Install the protective cover over headlamps locking it in place with
three knobs.
5. Turn the headlamps on and make sure they work properly. If the
headlamp was correctly aligned before you changed the bulb, you should
not need to align it again.
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