Lincoln 1998 Continental - Manual (Page 152)

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.
AIMING THE HEADLAMPS
Your vehicle is equipped with a Vehicle Headlamp Aim Device (VHAD)
on each headlamp. Each headlamp may be properly aimed in the vertical
(up/down) and the horizontal (left/right) directions using your VHAD
system. The headlamps on your vehicle are properly aimed at the
assembly plant.
A bubble (vertical indicator) that is not centered between the two red
lines does not necessarily indicate out-of-aim headlamps. If your vehicle
is not positioned on a level surface, the slope will be included in the
vertical indication. Therefore, vertical and horizontal headlamp
adjustment should be performed only when the beam direction appears
to be incorrect.
You will need one 4 mm wrench or socket to make the adjustments.
If the vehicle has been in an accident, the vehicle’s front structure
should be properly aligned before aiming the headlamps.
Horizontal aim adjustment
1. With the hood open remove the
protective cover, locate the
horizontal indicator and adjusting
screw. They are located below the
viewing hole at the rear of the
headlamp assembly.
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Maintenance and care
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