Anyone change headlight adjust when loaded? - Page 3 - Chevy and GMC Duramax Diesel Forum
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post #21 of 30 (permalink) Old 10-05-2019, 11:00 AM
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The amount of people out there with the "If I can see out, I don't care how many people I blind with my poorly adjusted headlights" attitude is astounding.

This had the potential to be a good thread. Would be curious to see if GM accounted for a load when aiming the lights from the factory. Part of me wants to believe they did, but I don't have much faith in them so I'm more inclined to say they did not.

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post #22 of 30 (permalink) Old 10-05-2019, 11:02 AM
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Originally Posted by JimmyD View Post
I believe this is a solution looking for a problem.

All of the GM HD trucks are built with an unloaded forward rake in them that none of us like, including me.

Like some others here, I tow heavy (>3K pin weight) and when hooked/loaded, my truck sits perfectly level (I guess the GM engineers made this assumption during load calculations). Have never had anyone flash their lights at me or give me the one finger salute due to blinding the oncoming vehicle and I have never adjusted the headlights. I just completed a 1980 mile trip with my rig that included some night time towing without any issues. FWIW both my headlights and suspension are bone stock minus Sulastic shackles.

Your truck is certainly capable of towing the weights that you have indicated. Load 'er up, make the trip and enjoy the ride. You will enjoy it more without the over analysis of the issue IMHO.

OBTW, I am an aeronautical engineer by trade.
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post #23 of 30 (permalink) Old 10-05-2019, 03:58 PM
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I'm trying to remember if the owner's manual has instructions for aiming headlights. It's pretty simple, you just need a wall, 25 level feet and a straight edge and a black marker. But like almost every one is saying, airbags are the trick.

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post #24 of 30 (permalink) Old 10-05-2019, 06:18 PM
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I know with my gmc you cant adjust the headlights

To many vehicles to little time! New LP5 owner first 2017 GMC Denali Duramax
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post #25 of 30 (permalink) Old 10-05-2019, 08:43 PM Thread Starter
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Op here.

My '19 Chevy has adjusting screws. From empty to enough wt in bed/hitch to reach GVWR, the rear goes down 2" and front stays virtually same HT. Using the 25' to wall scheme, this raises headlights 4" at the wall.

I discovered that one full turn clockwise on adjusting screws will lower the beam at the wall 2". So, I marked the screws and a screwdriver with a reference mark and can make the correction when a trip is going to extend after dark.

Now all I have to do is remember to do it and undo it.

PS:. The screw will take a large Phillips, but really takes #2 square drive.
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post #26 of 30 (permalink) Old 10-05-2019, 11:00 PM
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Op here.

My '19 Chevy has adjusting screws. From empty to enough wt in bed/hitch to reach GVWR, the rear goes down 2" and front stays virtually same HT. Using the 25' to wall scheme, this raises headlights 4" at the wall.

I discovered that one full turn clockwise on adjusting screws will lower the beam at the wall 2". So, I marked the screws and a screwdriver with a reference mark and can make the correction when a trip is going to extend after dark.

Now all I have to do is remember to do it and undo it.

PS:. The screw will take a large Phillips, but really takes #2 square drive.
Good Info, Thanks
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post #27 of 30 (permalink) Old 10-06-2019, 08:51 AM
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My truck came hitting tree tops while loaded.Aimed them so they had a some what short distance while empty.They were still too high loaded until air bag lift of an inch or so. Thought about lowering rear end to get that happy middle aim. I mostly tow so this works for me .
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post #28 of 30 (permalink) Old 10-06-2019, 07:36 PM Thread Starter
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Stock low beams are so bad I added two 50 watt driving lights.......

I would have 100 watt fixtures but too big....they set off the park assist.

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post #29 of 30 (permalink) Old 10-07-2019, 04:58 PM
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Stock low beams are so bad I added two 50 watt driving lights.......

I would have 100 watt fixtures but too big....they set off the park assist.
Look into the HID bulb swap. I'm assuming you have the halogen projectors like most people do. The HID swap improves them radically so I've heard

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post #30 of 30 (permalink) Old 10-07-2019, 05:34 PM
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100 watts? What lumens?
I have 6K lumens and no issues .

16 GMC Denali 3500 stock for now
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