Ford 1996 Taurus Manual page 315

Vertical aim adjustment
1. With the hood open, locate the bubble level
vertical aim indicator. It is visible when
viewed from above and to the rear of the
headlamp.
2. With the vehicle on a level surface, use a
4mm wrench to turn the vertical aim
adjustment screw (outboard screw) located
on the back of the lamp assembly clockwise
or counterclockwise until the bubble in the
spirit level is centered when viewed from
directly above the bubble.
3. Close the hood.
If the vehicle is on a downward or upward
slope of not more than 1.2˚, the VHAD's bubble
level can be used to correct for the effects of the
surface slope, provided that the slope is
accurately known.
Each graduation of the bubble level represents
0.19˚ of downward or upward slope. To correct
for the effects of a surface slope, turn the
vertical aim adjustment screw until the bubble is
centered at a position corresponding to the slope
of the surface.
Each 0.1 inch difference in surface height
between the front and the rear wheels
corresponds to 0.053˚ of surface slope; each 0.19˚
of surface slope corresponds to 0.36 inches
difference in surface height between the front
and rear wheels.
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