Mercedes-Benz 1998 SL 500 Operator's Manual page 122

7. Horizontal headlamp aim
(low beams on):
Turn adjusting screw (1)
(Right front headlamp:
counterclockwise to adjust to
the left, clockwise to the
right; left front headlamp:
counterclockwise to adjust to
the right, clockwise to the
left.) until the headlamps
(low beam) illuminate the
test screen as shown. The
vertex of the angle formed in
each beam image should
align with the vertical
centerline (8) of each lamp.
The left and right headlamps must
be adjusted individually.
8. The indicator (7) in the sight
glass should align with the "0"
mark after any horizontal
adjustment. If it does not, insert
and turn screw driver on
adjuster (3) until scale (7) is
centered on the"0" mark.
Graduations: 0.38° pitch.
9. Reinstall access cover (4).
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