User Manual

• Fender liners and access caps
must be re-installed after service to
protect the headlamp from high
pressure water spray and gravel
bombardment.
•
Lenses can be polished by a
professional polishing service not
more than twice before being
replaced.
• The headlight assembly is
equipped with filtered vents that
allow for cooling of the bulbs and
evacuation of water vapor. The
filters are intended to keep insects
out and are NOT serviceable
because the caps that hold the
filters will be destroyed if they are
removed. Keep obstructions, or
obstructing agents like mud, away
from the vents.
• A discolored bulb (one that is other
than clear) is an indication that it
has overheated. It may perform
poorly, be close to failure, and
should be replaced as soon as
possible.
• Headlight cover lenses should be
cleaned with a mild, particulate-
free, dish soap (e.g. Dawn, or Joy).
The headlight should never be
cleaned with an abrasive scouring
powder or soap, nor with
petrochemicals like Gasoline or
Diesel as these will break down the
hard coating and cause crazing in
the lens.
• Be aware that some truck loads
can require re-aiming of the
headlights by a trained technician
due to a change in vehicle rake.
• If the cover lens is worn to the point
that it is no longer transparent, but
translucent or opaque, the
headlight should be replaced.
• Bulbs should be replaced with a
premium brand (e.g. Phillips,
Osram, Sylvania, Federal-Mogul,
or GE). Bulbs with the long life
designation "LL" are
recommended, but not required.
• The headlight covers are designed
to withstand the force of wind, but
cannot be used to push solid
objects, or be pushed on, with
significant force.
• When replacing a bulb, do not
touch the globe with your fingers.
Oil from human skin can focus the
light locally, resulting in early bulb
failure.
How to Replace a Headlight Bulb
Each headlight assembly contains three
bulbs:
•
Low beam/high beam
• Daytime running light (DRL)/
parking light
• Turn signal/side marker/side turn.
Replacing a headlight bulb is accomplished
by opening the hood and accessing the
rear of the headlight (located behind a
removable fender panel). See Vehicle Light
Bulb Specifications for bulb replacement
data.
1. Park the vehicle and apply the
parking brake.
2. Open the hood and secure it in the
open position (see How to Open
the Hood).
3. Remove fender liner to access
headlight assembly (How to
Remove a Fender Liner on page
196).
4. Replace a headlight assembly
bulb:
When replacing the low beam/high
beam bulb, the low beam/high
beam socket cap must first be
unscrewed and removed.
MAINTENANCE - Headlights
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