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Assemblies may include halogen or incandescent test bulbs that should be replaced before installation.
Features and Benefits
Direct Fit - No vehicle or wiring modification necessary
DOT, SAE, and FMVSS Compliant - Meets on-road use regulations
Matching set for a restored look
Item Condition:New
Attention California Customers:
WARNING: This product can expose you to chemicals including Chromium (Hexavalent Compounds), which is known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov
Lifetime Warranty
This item is backed by our limited lifetime warranty. In the event that this item should fail due to manufacturing defects during intended use, we will replace the part free of charge. This warranty covers the cost of the part only.
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How to Replace Headlights 1999-2004 GMC Sierra 2500
Created on:
Tools used
No Tools Needed
1. Handling the Bulbs
Note: DO NOT TOUCH the bulbs- the oil from your fingers will burn into the light and foul your bulb.
Clean with rubbing alcohol and a soft cloth if the bulbs do get touched.
2. Remove the old headlight assembly
Pop the hood and secure it.
Remove the two anchor pins securing the head light assembly by twisting and pulling them up.
Remove the head light assembly.
Unplug the bulbs and harness.
3. Install the new headlight assembly
Plug in your bulbs, replacing them with new ones if necessary.
Reconnect the harness by clipping it in.
Line up the head light assembly and clip it into place.
Put the two pins back into place to secure the head light assembly.
Close the hood and enjoy your new 1A Auto headlights.
This video is brought to you by 1AAuto.com, your source for quality replacement parts and the best service on the Internet. Hi, my name's Mike Green. I want to help you save time and money repairing your vehicle. I have 20-plus years experience restoring and repairing cars and trucks. My company, 1A Auto, sells high quality replacement parts over the Internet. In this video, I'll be showing you how to install these parts. By the end of this video, you'll know how to install them and where to get them. That's going to save you time and money. Thank you and enjoy the video.
This video, we'll be replacing the headlight on a 2004 GMC Sierra, basically the same as a '99 to '06 Sierra. It is a pretty easy process. It requires no tools. So, with that, we'll get you to it.
There are two pins that hold the headlight in right there and there, and you'll twist those out and pull them up. Then, the headlight basically comes right out. Then, once it's out, you can reach in behind and unplug the lights. They're basically just little teeth that you can kind of pull with your thumb, and they unplug.
Okay, now we're going to replace the headlight. At this time, you can obviously service the bulbs if that's all you're looking to do. So, they just twist in ... or twist out and twist back in. Then, our headlights come with that whole bracket and everything, so if you're replacing your headlights at this point, you're plugging them in and then everything should install just the same way. Plug them in, put the headlight back in there. Take your pins, put them down through. Obviously you have to make sure that the headlight is all the way back in and lock them into place, and your head light's all set.
Now, we'll do a quick test. Just make sure everything's working. The headlight, the high beam, and the signal are not working. Actually that side marker's not working, so we'll really quickly replace that, and then, you're all set. Hope this helps you out. Headlights are pretty easy to service on these GMC trucks.
This video was brought to you by www.1AAuto.com, your source for quality replacement parts and the best service on the Internet. Feel free to call us toll free 888-844-3393. We're the company for you on the Internet, and there for you in person too. Thank you very much.
LHT04250
In Stock
Product Reviews
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4.70/ 5.010
10 reviews
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Price was right.. fit perfectly BUT
M
January 19, 2018
So I would be THRILLED with these items except for the following two issues
1 - There were NO instructions on how to adjust the headlight beams Up/down.
2- trying to wiggle the unit so that the holes align and the guide pins fall into place actually was enough to break the black plastic cradle inside the unit in half. I had to crazy glue it back together. That's really bad in my opinion because it REQUIRES that you wiggle it until the pin falls into place..
3-The plastic retaining ring that holds the headlight bulb in place was not attached and was clearly defective.. again crazy glue to the rescue...
Good product, good price
Craig
March 18, 2018
Came with bulbs installed for high and low beam....one height adjuster was broken and they sent me a new one immediately.
Glad I pulled teh trigger on these!
Rich
October 16, 2018
I had ordered a les expensive set; however once they arrived I knew I had mad a mistake by trying to do it on the cheap. I sent those back and ordered these as my next try. No need for a 3rd try. These are as close to factory as one can get, installed easily, and adjusted easily. I do not think they adjust the bulbs at all as mine were aimed right at the ground when installed.... even but right at the ground. The adjustment screws made it very easy to put the beams where I wanted them in less than a minute. Good buy and they look great!
Good product, great customer service
J
November 17, 2018
My headlights were too far gone to save. This set of four were reasonably priced. Theyre a little different than OEM, but look the same and work great. One unit had a broken component, but 1A shipped a replacement immediately. 1A YouTube video made the replacement easy.
Deer damage to 2006 GMC Denali
Steven
August 10, 2020
Revived the new parts in a timely mater and parts fit perfect. ??????
Excellent Fit & Quality Products
B
March 7, 2021
I was hesitant on purchasing non genuine parts especially headlights and mounts where the smallest discrepancy can make for a hard install. I was very impressed with these parts. The headlights and running lights came in perfectly with no defects or broken pieces l, main headlights bulbs were included. Bottom line Id recommend them to anyone and shipped quickly. 5 stars
jerry
August 5, 2021
CAN ONLY TELL YOU WHAT MY SON TOLD ME , GOT THIS FOR HIS BIRTHDAY . HE WAS IMPRESSED THAT THEY ACTUALLY CHANGED RATHER EASILY WITH NO PROBLEMS . THINK HE EXPECTED A HARDER TIME OF IT . THAT'S WHY THE FIVE STARS . EVERYTHING LOOKS FACTORY .
2004 GMC Yukon XL Denali lighting Looks Like New
Scott
December 11, 2021
Product was well packaged and shipped quickly. I took on chance on these because the fit compatibility included the 2004 GMC Yukon Denali but did not include the Yukon XL Denali. This item is a direct replacement fit for the 2004 GMC Yukon XL Denali. I am very pleased with the product and ease of installation. Looks Great!
Fit perfectly fast shipping thanks
Jb
December 14, 2021
Fit perfectly
Lucas
September 28, 2022
Excellent plug and play. Bring an older Yukon Denali back to life.
Customer Q&A
Will these fit the non Denali model gmc vehicle with no modifications?September 5, 2018
Strapp S
10
These are not listed to fit the non-Denali models.
September 5, 2018
Christa R
Can these be fitted with led bulbs, and if so, which ones?October 30, 2023
Carl K
10
These parts are intended for models with halogen bulbs from factory and LED bulbs will not be correct for these assemblies.
October 31, 2023
Nick R
Customer service
877-844-3393
Monday - Friday 8:00am - 9:30pm ET Saturday - Sunday 8:00am - 4:30pm ET
GMC is a registered trademark of General Motors Company. 1A Auto is not affiliated with or sponsored by GMC or General Motors Company.See all trademarks.
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