Regardless you feel you can’t see as well through the night, whether you feel you’re lighting too low or too high, in all of these circumstances, there’s only one component of your car to blame – your low beams. Although this adjustment may look easy to do thanks to the thumbwheel on your dashboard, a whole adjustment is much more complex than this common realignment, and in this content, we will discover how to adjust the low beam lights of your GMC Sierra? For this, first of all we will discover why you should adjust your lights, and, secondly, how to adjust the low beam lights of your GMC Sierra.

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Why adjust the low beam lights of your GMC Sierra?

So let’s commence our content with the interest of adjusting the low beam lights of your GMC Sierra. For most people these lights are well enough adjusted, and it seems that they light up enough at night. However this is not necessarily the case and examining this setting, either because the low beams of your GMC Sierra are not illuminating well, or because you have the feeling that they are too low or too strong is a good option .

Adjusting the low beam of your GMC Sierra for safety is a good option.

Firstly, the adjusting of the dipped headlights of an GMC Sierra must be done for a elementary safety reason. Whether it’s for you, or for the other drivers you encounter during your night trips. In reality, if you don’t see enough, the real danger is to fail to see an obstacle on the route, or to anticipate a curve badly. On the contrary, if your lights are too strong, you risk dazzling the car owners in front of you, and thus putting yourself at risk. It is consequently imperative for others as well as for you to have an ideal setting of your parking lights.

Setting the low beam headlights of an GMC Sierra for law motives

Additionally to safety, there is a law that supervises the power, the adjustment of low beams of cars, here is what it specifies: have between 2 and 4 headlights that illuminate at least 30 meters. Another legislation supervises their use, the European one (directive 76/756/EEC), which stipulates that the height of the beam must be between 500 mm and 1200 mm from the floor, and that they must be at least 600 mm apart.

How to adjust the low-beam headlamps of a GMC Sierra?

We will now go forward to the section that interests you the more in this content, how to adjust the low beams of his GMC Sierra? This setting may seem to be a bit complex, but if you follow the guidelines you should be able to do it without too much problem.

Preparations to set the low beam of a GMC Sierra

To start, you will need to prepare your car to adjust your low beam lights in good conditions, here are the preparations to apply:

  • Place your car on a surface in front of a white wall for example, about 4 or 5 meters from the wall.
  • Examine your tire pressure carefully.
  • Examine that the height adjustment knob for the lights is set to 0
  • .

  • Try doing that with half a full tank.
  • Remove all unneeded weight from the car, only one person should be in the driver’s seat.

The setting of the low beam headlights of his GMC Sierra

Once your car is in place, 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. Make sure with a level that both parts of the cross are straight. Then move back your car up to a distance of between 7 and 10 metres. For the rest of the operation here are the steps to follow:

  • Open your bonnet, situate the screws for horizontal and vertical adjustment of the lights of your GMC Sierra (they are in general marked, and those above must adjust the verticality and those on the side handles the horizontality of the adjustment).
  • Use a cloth or something else to hide the light on which you are not making the modification.
  • Using the screws to make the horizontal modification, you should have the most powerful part of the beam which should be a little to the right of the vertical line marked on the wall
  • .

  • With regard to vertical adjustment, 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 complete, check that the low beam setting of your GMC Sierra is consistent on the road, do not be reluctant to check that it has been driven, sometimes it may move.

If you want to adjust the fog lights on your GMC Sierra, please examine our content on this subject.

In the event that you have any additional questions about the GMC Sierra, do not hesitate to consult our GMC Sierra category.