Headlights — adjustment

Note: The headlights must be aimed correctly. If adjusted incorrectly they could blind the driv­er of an oncoming vehicle and cause a serious accident or seriously reduce your ability to see the road. The headlights should be checked for proper aim every 12 months and any time a new headlight is installed or front end body­work is performed. It should be emphasized that the following procedure is only an interim step that will provide temporary adjustment until a properly equipped shop can adjust the headlights.

1. The vertical adjustment screws are located behind each headlight housing (see illustration). There are no horizontal adjust­ment screws.

15.1 To turn the headlight housing vertical adjustment screw, insert a Phillips screwdriver into the top

Chevrolet Silverado  _

2. There are several methods for adjusting the headlights. The simplest method requires masking tape, a blank wall and a level floor.

3. Position masking tape vertically on the wall in relation to the vehicle centerline and the centerlines of both headlights (see illustration).

15.3 Headlight adjustment details

4. Position a horizontal tape line in relation to the centerline of all the headlights.

Note: lit might be easier to position the tape on the wall with the vehicle parked only a few inches away.

5. Adjustment should be made with the vehicle parked 25 feet from the wall, sitting level, the gas tank half-full and no heavy load in the vehicle.

6. Starting with the low beam adjustment, position the high intensity zone so it is two inches below the horizontal line. Adjustment is made by turning the adjusting screw clock­wise to raise the beam and counterclockwise to lower the beam.

Note: It might not be possible to position the headlight aim exactly for both high and low beams. If a compromise must be made, keep in mind that the low beams are the most used and have the greatest effect on safety.

7. With the high beams on, the high intensity zone should be vertically centered with the exact center just below the horizontal line.

8. Have the headlights adjusted by a dealer service department or service station at the earliest opportunity.

Warning: Halogen gas-filled bulbs are un­der pressure and can shatter if the surface

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