If you experience you can’t see as well at night, or you experience you’re lighting too low, or too high, in all these scenarios, there’s only one part of your car at fault – your headlights, as well identified as high beams. Although this adjustment may seem easy thanks to the thumbwheel on your dashboard, a whole adjustment is much more technical than this basic manipulation, and in this post, we are going to see how to adjust the headlights of your GMC Sierra? To do this, first we will see why you need to adjust your high beams, and secondly how to adjust the headlights of your GMC Sierra.
Why adjust the headlights of your GMC Sierra?
So let’s start our content with the benefit of adjusting the headlights of your GMC Sierra. For many of us, our headlights are adjusted sufficiently, and they appear to light up enough during the night. Regrettably this is not constantly the case and checking this setting, either because the headlights on your GMC Sierra are not bright enough, or because you have the feeling that they are too weak is a great idea .
Adjusting the high beams of your GMC Sierra for safety
First of all, the headlight adjustment of a GMC Sierra must be carried out for a basic security explanation. Whether it’s for you, or for the other users you come across during your night trips. In actual fact, if you don’t see enough, the risk is to miss out an obstacle on the road, or to anticipate a curve badly. On the other hand, if your headlights are too powerful, regardless if you are supposed to switch to low beam lights when you pass a car, the time needed to make this switch will most of the time expose the driver in front of you to the headlight beam of your GMC Sierra . It is consequently important for others as well as for you to have an ideal adjustment of your headlights.
Adjusting the headlights of a GMC Sierra for legal reasons
Furthermore to security, there is a law that supervises the power, the adjustment of car headlights (articles R313-2 of the Highway Code), here is what it specifies: have between 2 and 4 headlights that illuminate at minimum 100 meters. Another legislation supervises their use, the European one (directive 76/756/EEC), which stipulates that there is no maximum height for the adjustment of the headlights, but that the maximum width of the beam must be very same to that of the dipped headlights and that the maximum luminosity must be 225, 000 cd.
How to adjust the headlights of a GMC Sierra?
We will now go forward to the section that concerns you the most in this post, how to adjust the headlights of his GMC Sierra? This setting may seem a bit difficult, but by following the instructions you should have the ability to accomplish it without too much issue.
Preparations to adjust the headlights of a GMC Sierra
First of all, you’ll need to prepare your car to adjust your high beams in good conditions, here are the preparations to executed:
- Place your car on a surface in front of a white wall for example, about 4 or 5 meters from the wall.
- Check your tire pressure cautiously.
- Check that the height adjustment knob for the lights is set to 0
- Try doing that with half a full tank.
- Remove all needless weight from the automobile, only one person should be in the driver’s seat.
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The headlight adjustment of his GMC Sierra
Once your car is in position, you will turn on your dipped beam and make a cross-shaped mark (one horizontal and one vertical section) in the middle of the beam that will be projected on the wall. Check with a level that both parts of the cross are horizontal. Then back your car up to a distance of between 7 and 10 metres. For the rest of the procedure here are the steps to follow:
- Open your hood, identify the screws for horizontal and vertical control of the headlights of your GMC Sierra (they are generally marked, and those on top must adjust the verticality and the one on the side adjusts the horizontality of the adjustment).
- Use a cloth or something else to hide the projector on which you are not making the correction.
- Using the screws to make the horizontal correction, you should have the most intense part of the beam which should be a little to the right of the vertical line marked on the wall
- With regard to vertical correction, you will have to use the screw to try to position the upper end of the beam at the level of the horizontal marking on the wall, or slightly below.
- Once finished, verify that the headlights setting of your GMC Sierra is coherent, do not hesitate to verify it after you have driven it, occasionally it may move.
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If you want to adjust the fog lights on your GMC Sierra, please read our content on this subject.
If you wish more tutorials on the GMC Sierra, go to our GMC Sierra category.
