Aiming / Adjusting Headlights

LTZTom · February 16, 2014

Is there a measurement (distance/height) where the beams should be projected on a wall? Since I lowered my truck 2 3/4" in the rear my headlights are lighting up road signs and blinding oncoming drivers. I should have marked my wall before I did it but I forgot.

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cmpcpro · February 16, 2014

Yeah since I have put the HID's in my LTZ projectors I am getting a few people flashing me, and I know when I put the HID's in my brand new Equinox they seemed to shoot up alot higher, and had the same issue..

fondupot · February 16, 2014

1. measure the height of the headlight beam at the bumper

2. park your truck on a level surface about 25-30 feet from a wall where the headlights are projected clearly.

3. adjust the cutoff beam so that the beam is 2.5" lower than the measurement you took in step 1.

4. adjust so each side is the same height.

5. done

SLESierra · February 16, 2014

http://www.popularmechanics.com/cars/how-to/repair/1347221

LTZTom · February 16, 2014

Thanks for all the good info. I'll try this tonight after dark.

tanner709 · March 13, 2014

Hey everyone,

Just curious if anyone has a good procedure or details on where the cutoff should be approximately at a specific distance from a wall on level ground. The reason I ask this is because I notice I'm blinding a few drivers after installing my RC level. In hindsight I should of marked the before level and the re-adjusted but I got a little ahead of myself.

Any help would be appreciated, thanks!

GMC-AT · March 13, 2014

If you have a Sierra leave the headlights alone. Most agree they need to be adjusted higher from the factory anyway. so with the level kit.. you should just about perfect.

I have a 2in level... and actually have them raised higher a little bit.

amxguy1970 · March 13, 2014

If you have a Sierra leave the headlights alone. Most agree they need to be adjusted higher from the factory anyway. so with the level kit.. you should just about perfect.

I have a 2in level... and actually have them raised higher a little bit.

Did you miss the part where he said "The reason I ask this is because I notice I'm blinding a few drivers after installing my RC level"? Kind of a hint when others are flashing you that your lights are too high. Not to mention I am pretty sure that is on the check list for every auto manufacturer (are headlights set at appropriate level? Check), so i bet they are fine from the factory (hasn't ever been mentioned in any tests I have read).

Tyler

gmc1 · March 13, 2014

Did you miss the part where he said "The reason I ask this is because I notice I'm blinding a few drivers after installing my RC level"? Kind of a hint when others are flashing you that your lights are too high. Not to mention I am pretty sure that is on the check list for every auto manufacturer (are headlights set at appropriate level? Check), so i bet they are fine from the factory (hasn't ever been mentioned in any tests I have read).

Tyler

Ha that was kinda funny.

As far as the headlights there was another post I found that described a procedure on how to level em out, if I remember correctly:

Park ~ 20 feet from a wall on a level surface.

Measure the height of the beams from ground at the front bumper (best you can)

And finally at the wall the cutoffs should be ~ 3 inches lower than they were at the bumper.

I did this after I had the RC level installed (I didn't have the foresight to measure beforehand either) and it seemed to be pretty accurate. It was difficult to measure the exact cuttoff at both distances for me so mine were still slightly high after i did what was described above. That should get you close tho

LTZTom · March 14, 2014

I ended up doing the "hit and miss" option. But I finally got them "semi right" I guess. Since there wasn't any side to side adjustment, the up and down was pretty easy.

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Mike1220 · March 22, 2014

I ended up doing the "hit and miss" option. But I finally got them "semi right" I guess. Since there wasn't any side to side adjustment, the up and down was pretty easy. Tapatalk via iPhone 5s

are you saying that your headlights did not need to be adjusted side to side or that they did not have the side to side adjuster? If I'm not mistaken, the side to side adjuster should be on the back end of the headlight

LTZTom · March 22, 2014

I didn't see the side adjusters but I didn't look for them. Didn't need side to side only up and down. I'm not saying they aren't there just that I didn't need them. Let me know where they are if you find them.

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tanner709 · March 23, 2014

Thanks guys

captaincarl · April 5, 2014

Greetings Y'all.

Has anyone figured out how to adjust the 2014 GMC Sierra projector headlights side to side (right/left)? I found how to adjust the up/down but despite nearly crawling into the engine compartment I can't find an adjuster of the side to side variety!

Thanks,

Carl & '14 Sierra All Terrain Ed.

MotoMedic · April 5, 2014

The left/right adjustments are indeed on the upper rear corners of the headlight housings and look identical to the up/down adjustments on the top of the headlight (white plastic circle with cross-cuts for Phillips screw driver).