Jump to content

Headlight Aiming


Recommended Posts

The owner’s manual says see the dealer for headlight adjustment. I’m interested in adjusting mine down a little to compensate for my camper lowering the rear a couple of inches. Does anyone know if the adjusting means is easily accessible?

Link to comment
Share on other sites

Adjusting your headlights is not done with a screw at the top of the headlight. That is an incorrect procedure. Every year, many many people die because they were blinded by oncoming headlights that were misaligned. This is very common:  "I could not see, so I ran off the road, and now my husband/wife/kid is dead..." If you do not know EXACTLY how to adjust your headlights, then you should not attempt to do so without obtaining the proper procedure. Take it to a shop and pay them the $50 to do it properly. Better safe than sorry.

 

Other people will say this is dumb, and you can adjust them yourself.

 

 

In response, I say:

 

 

 

 

 

 

 

adjusting-headlights.jpg

 

 

High-Beam-Only-Headlight-Aiming-Step-6.j

 

 

9ca7b70.gif

 

Edited by Supreme Pizza
Link to comment
Share on other sites

I know how to properly aim headlights  - I’ve been doing it for 40 years. I just was wondering if GMC has made the adjustment method impossible for a DIY person after reading the manual. My truck is out in the barn and it’s cold, rainy, and windy out, so I was asking here rather than looking myself. The camper stays on almost all the time, so I want to adjust them for that load. I have no problem with having the headlights aimed a little low for the small amount of unloaded operation I do.  
 

The camper weighs 1800 lb and the payload is 4054 lb, so it will be a small adjustment. However, I’ve been flashed enough times that I want to be courteous to other drivers and fix it. 

Link to comment
Share on other sites

5 hours ago, Supreme Pizza said:

Adjusting your headlights is not done with a screw at the top of the headlight. That is an incorrect procedure. Every year, many many people die because they were blinded by oncoming headlights that were misaligned. This is very common:  "I could not see, so I ran off the road, and now my husband/wife/kid is dead..." If you do not know EXACTLY how to adjust your headlights, then you should not attempt to do so without obtaining the proper procedure. Take it to a shop and pay them the $50 to do it properly. Better safe than sorry.

 

Other people will say this is dumb, and you can adjust them yourself.

 

 

In response, I say:

 

 

 

 

 

 

 

adjusting-headlights.jpg

 

 

High-Beam-Only-Headlight-Aiming-Step-6.j

 

 

9ca7b70.gif

 

With that much knowledge, you ain't gonna answer the OP question? You are telling him to flatten his tires?

 

Some of us turn wrenches, know up from down, and would like to know where the adjustment takes place, setting in the house. 

 

OP, I will look today for you, 55° and sunny here the weatherman says for today.

  • Like 1
  • Thanks 1
Link to comment
Share on other sites

16 hours ago, Another JR said:

The owner’s manual says see the dealer for headlight adjustment. I’m interested in adjusting mine down a little to compensate for my camper lowering the rear a couple of inches. Does anyone know if the adjusting means is easily accessible?

Dunn was spot on, answering your question, if'n the 25/3500's are the same as 1500's.

 

Skip to minute 5:15...

 

 

Link to comment
Share on other sites

3 hours ago, gemarsh said:

With that much knowledge, you ain't gonna answer the OP question? You are telling him to flatten his tires?

 

Some of us turn wrenches, know up from down, and would like to know where the adjustment takes place, setting in the house. 

 

OP, I will look today for you, 55° and sunny here the weatherman says for today.

Thanks for the help, gemarsh. Use of tire pressure to aim headlights on a truck was a new one for me, too.  

Link to comment
Share on other sites

My 15 2500HD has the screws did it in driveway at night.

l changed to HID setup so it was critical for height. 
Bright as heck and very definitive line to see.
Also Morimito fogs needed adjustment they also have screws.  

Link to comment
Share on other sites

  • 4 weeks later...

I finally looked at the back of the headlight assembly and easily found the vertical adjustment feature. You need either a long #1 phillips screwdriver or a long (about 5 inch long) 6 mm hex wrench. The mechanism turns easily. I did not readily see the horizontal adjustment feature. I didn’t look for it because I am only compensating for leveling my truck by installing a pop up slide-in camper.  
 

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.