Headlamp Unit Replacement; Headlamp Adjustment - GMC G Service Manual

8B-14 CHASSIS ELECTRICAL

HEADLAMP UNIT REPLACEMENT

|++| Remove or Disconnect (Figures 6 and 7)
1. Battery ground cable from the battery.
2. Headlamp bezel retaining screws.
3. Bezel.
4. Retaining ring screws.
• Be careful not to move the adjustment screws.
5. Retaining ring spring, using a hooked tool.
6. Retaining ring from the mounting ring.
7. Headlamp unit.
8. Headlamp electrical connector.
K H Install or Connect (Figures 6 and 7)
1. Headlamp electrical connector.
• On the dual headlamp option, the 2A1 head-
lamp is the upper unit and the 1A1 headlamp is
the lower unit.
2. Headlamp.
3. Retaining ring.
4. Retaining ring screws.
• Make sure that the headlamp is properly
seated.
5. Retaining ring spring.
6. Bezel.
7. Bezel retaining screws.
8. Battery ground cable to the battery.

HEADLAMP ADJUSTMENT

Horizontal and vertical aiming of each headlamp is done
by two (2) adjusting screws which move the mounting ring
against the tension of the coil spring (figure 8).
Some state and local authorities have specific require­
ments for aiming headlamps and these requirements
should be followed.
Replacement of a headlamp will normally not require
aiming adjustment. However, do check the aim.
Use the safety aimer J 25300-B or equivalent (figure 9).
Instructions for using the safety aimer are supplied by the
instrument manufacturer.
20. Vertical Adjusting Screw
21. Horizontal Adjusting Screw
Figure 8 — Headlamp Aiming Screws
Figure 9 — Headlamp Aimer
F-00821