GMC 1999 Sierra 1500 Pickup Owner's Manual page 333

Sealed Beam Headlights
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1. Remove the four screws from the headlight retainer.
2. Pull the headlight out and remove the retainer.
3. Unplug and remove old headlight.
4.
Plug in the new headlight and put it in place.
5. Install the retainer to the headlight.
6. Install the screws.
Halogen Bulbs
Halogen bulbs have pressurized gas inside and can burst if you drop
or scratch the bulb. You or others could be injured. Take special care
when handling and disposing of halogen bulbs.
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Avoid touching the bulb or letting it come in contact with anything damp
Oil from your skin or moisture on the bulb can cause the bulb to explode
when
it
is turned on. If either comes in contact with the bulb, clean it with
alcohol or a suitable degreaser and wipe the bulb dry.
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