Ford F150 1997 Owner's Manual page 199

Maintenance and care
4. Slide headlamp assembly
forward and off of guide ribs to
expose the back of the bulb and
wiring connector.
5. Remove the electrical connector
from the bulb by grasping the wire
and pulling it rearward.
6. Remove bulb retainer ring by
turning it counterclockwise about
1/4 turn, then slide the ring off the
plastic base.
7. Without turning, carefully pull
bulb assembly out of headlamp
assembly.
8. Insert the glass end of the new
bulb into the headlamp assembly
socket. When the grooves in the
plastic base are aligned, push the
bulb into the socket until the
plastic base contacts the rear of
the socket.
9. Slip bulb retaining ring over the
plastic base and lock the ring into
the socket by turning it clockwise
until you feel a "stop."
10. Push the electrical connector
into the rear of the plastic base
until it "snaps."
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