Ford F-150 2000 Introduction Manual page 238

Maintenance and care
9. Insert the glass end of the new bulb into the headlamp assembly.
When the grooves in the plastic base are aligned, push the bulb into the
lamp assembly until the plastic base contacts the rear of the lamp
assembly.
10. Install bulb retaining ring over the plastic base and lock the ring into
the socket by turning it clockwise until you feel a "stop."
11. Connect the electrical connector into the plastic base until it "snaps."
12. Straighten alignment pins,
making them parallel with the outer
edges of the attachment standoff.
13. Carefully insert the headlamp
assembly into the vehicle making
sure the alignment pins are inserted
into the proper holes and into the
guide ribs.
14. Hold the headlamp assembly
snugly against the vehicle and push down on the clips to lock the lamp
into place.
Replacing front parking lamp/turn signal bulbs
1. Remove screw from the lamp
assembly.
2. Disengage lamp assembly (it has
a snap fit).
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