I just did this a couple of days ago. It's very easy. Open your hood, You'll notice right above your headlights are 2 hex shaped screws. Use a hex socket the same size to remove BOTH of the screws. Gently pull out the plastic headlight casing. The High beam light is located towards the center of the vehicle and has a red gasket and the low beam is located towards the outside of the vehicle and has a green gasket. There should be a blue clip on the back of the bulb, gently unclip and pull off the clip. Then unplug the lamp. After you've done this, gently unscrew the bulb so the parts line up and the bulb can be removed. Change the bulb reversing what you did to remove it. It only takes about 10-15 minutes maximum. Hope that helps.
Posted on Jan 19, 2015
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SOURCE: How to replace the high beam bulb on a 98 GMC
Headlamp Bulb: Service and Repair
REMOVAL PROCEDURE
1. Make sure the headlamp switch is in the OFF position.
CAUTION: Halogen bulbs contain gas under pressure. Handling a bulb improperly could cause it to shatter into flying glass fragments.
To help avoid personal injury:
- Turn off the lamp switch and allow the bulb to cool before changing the bulb. Leave the lamp switch off until the bulb change is
complete
- Always wear eye protection when changing a halogen bulb.
- Handle the bulb only by its base. Avoid touching the glass.
- Do not drop or scratch the bulb.
- Keep dirt and moisture off the bulb.
- Place the used bulb in the new bulb's carton and dispose of it properly.
- Keep halogen bulbs out of the reach of children
NOTE: Avoid touching the bulb or letting the bulb come in contact with anything damp. Oil from your skin or moisture on the bulb can cause
the bulb to explode when the bulb is turned on. It either comes in contact with the bulb, clean the bulb with alcohol or a suitable degreaser and
wipe the bulb dry.
2. Remove the bulbs from the headlamp capsules by reaching from the engine compartment and by twisting the bulb counterclockwise.
3. Remove the 2 long screws from the top of the radiator support.
4. Pull forward the headlamp assembly (3).
5. Disconnect the electrical connector (2) from the burned out bulb assembly (1).
INSTALLATION PROCEDURE
IMPORTANT:
- Replace a high beam bulb with another high beam bulb. The high beam bulb has a red gasket.
- Replace a low beam bulb with another low beam bulb. The low beam bulb has a gray tip and a yellow gasket at the base.
1. Install the new bulb assembly (1) into the headlamp assembly (3).
Twist clockwise the bulb assembly.
2. Seat the bulb assembly with the connector facing down.
3. Connect the electrical connector (2) to the bulb assembly.
4. Install the headlamp assembly.
5. Install the 2 long screws through the top of the radiator support.
6. Tighten the screws.
Posted on Oct 30, 2009
SOURCE: drl work but no low beams on my 1998 sierra..
either the low beams are burned out ,or the dimmer switch is bad.
Posted on May 10, 2010
SOURCE: Low beams don't work; High beams fine. Not the
some have fuse under hood for high beams & low beams,,if ok,,u mite need a high & low beam switch,,,,
Posted on May 24, 2010
SOURCE: cant find the high beam
it maybe your high beam switch isnt working. look on your instrument panel and see if the indicator light is on saying your high beams are on.
Posted on Jan 30, 2011
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