Assemblies may include halogen or incandescent test bulbs that should be replaced before installation.
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
This item is backed by our limited lifetime warranty. In the event 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.
The bulbs are for testing and not covered under our warranty. Our warranty applies to the light assembly only.
FREE Shipping is standard on orders shipped to the lower 48 States (Contiguous United States). Standard shipping charges apply to Hawaii and Alaska.
Shipping is not available to a P.O. Box, APO/FPO/DPO addresses, US Territories, or Canada for this item.
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Final shipping costs are available at checkout.
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.
Product Reviews
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3.67/ 5.06
6 reviews
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Ruben
May 10, 2023
I purchased these headlights because I've gotten tired of other aftermarket headlights and they're cheap construction, but these weren't any different. It's been barely 7 weeks since I received and installed these headlights. The bracket that hold the headlight up with a bolt has broken off, as well as the chrome on the outside housing has already started to fade off. These headlights also are very dim even though they are brand new. I tried 3 different brands of bulbs as well as bought leds and they still were very dim. I understand that these things happen over time but not in just 7 weeks on a vehicle that is only used on weekends. I'd recommend anyone that's interested in these headlights to keep searching for another brand or manufacturer that makes better quality products (headlights).
Patrick
November 20, 2023
Actually haven't had them long,drove through the car wash and got water inside the light,guess I got a bad pair?
Mark
January 29, 2024
bought others and didn't last theses where inexpensive but very high quality
Rod
February 1, 2024
Fit perfectly. Looks great. Works great.
Highly recommend.
All liked.
Willie
August 25, 2024
went just like it was suposed to
George
August 27, 2024
Great stuff went in with ease
Customer Q&A
Are the lens glass?October 29, 2021
John D
10
Thank you for your inquiry! These have plastic lenses.
October 29, 2021
T I
Are these OEM quality?August 1, 2022
Steven M
10
These parts are manufactured from the same specifications as the OE parts and are backed by our limited lifetime warranty.
August 1, 2022
Kelly S
Customer service
877-844-3393
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