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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
How to Replace Parking Light 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.
Tools used
No Tools Needed
1. Remove the parking light assembly
Remove the two pins at the top of the assembly.
Pull the headlight out and disconnect
Unclip the parking light and disconnect the assembly.
2. Install the new parking light assembly
Connect the bulbs and wiring harness.
Clip the parking light assembly in.
Install the headlight by connecting the bulbs and wiring.
Secure with the two pins.
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 is Mike Green. I want to help you save time and money repairing your vehicle. I have 20+ years experience restoring and repairing cars and trucks. My company, 1A Auto, sells high quality replacement parts over the internet. In this video I will be showing you how to install these parts. By the end of this video, you will know how to install them and where to get them, and that is going to save you time and money. Thank you and enjoy the video.
In this video, we are going to replace the parking light on a 2004 Sierra 2500, which is basically the same as any 1999-'06 GMC Sierra. This is a pretty easy process, it doesn't require any tools. There is 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 and then once it is out, you can reach in behind and unplug the lights. They're basically just little teeth that you can pull with your thumb and they unplug. Then the parking light is actually snapped in. There is a little bracket that goes into the side there, and then a little piece that you squeeze and snap out there, and you can see it, switch hands here and I'll push on that tooth and the light will pop out.
Then you just pull it forward and twist out the bulbs, and you can now service either those bulbs or if you need to replace the whole parking light because it got damaged or broken, you can do that. Then to install is the reverse of the procedure, insert the harnesses and twist to lock in. Side marker light and you want to get the inside tooth in there first. Then you can see that at a little better angel here. That just presses right into that slot and locks in. Then you re-install your headlight. At this time, just to show you, you can service the headlight bulbs if you want to, just twist and pull them right out. That's the high beam, same thing with the low beam. They just twist and pull right out. If you were replacing that headlight, you can see that black bracket, you might be able to bolt that on to the new headlight or if you headlight assembly comes with that whole thing, then it just goes in that easily.
Just place the light back into place and use your pins, twist them into place and lock them and there you are. You've just replaced the parking light and we will do a quick test. The running lights, the low beams, high beams, and signals just to make sure and you see actually our side marker light is not working, so we will actually go back in and replace that small bulb and fix that side marker light.
We hope this helped you out and thank you very much. 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 are the company for you on the internet and there for you in person too. Thank you very much.
LHT04088
In Stock
Product Reviews
Loading reviews
4.52/ 5.086
86 reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
66
9
4
4
3
I ordered headlights
Peter
January 21, 2017
They fit perfect and looks great
J
July 30, 2017
Bought these for my 2000 gmc 2500 and could not be happier they made my Truck look like new again.I had no idea how bad my old lights looked until I put these new lights in WOW. Yes I would absolutely tell everybody to buy these lights.
Quick Installation and Look GREAT!
F
September 15, 2017
My old lights (factory installed) were starting to yellow on my 2006 GMC Sierra. The rest of my truck looks great, but the yellowed lights aged it. Ordered these, received them within a couple days. Installation was about 15 minutes and my truck looks 10 years newer! Also ordered a pair for my GMC Envoy and those looks great as well. Would highly recommend. The installation is quick and easy and the fit is perfect. The lights are very bright and look great.
Sort of OK
Lewis
September 18, 2017
This kit of 4 lights arrived promptly and looked good out of the box. Installation was easy and they even had the headlight bulbs included. After a couple days noticed the parking lights were fogging up after heavy rain, would clear up after a day but kept fogging. Checked them over and seems like a bead of clear silicone is needed on the top seams. These are bright, fitment is good and they look nice on the truck but they seem to be of thinner materials and are lacking proper sealment and venting. Good for a truck you are going to sell.
Headlight replacements
Perry
November 8, 2017
These headlights are fantastic easy to change out buy the difference it makes is amazing the truck looks new again
Great Look
Rick
December 21, 2017
My old lights were yellowed, scratchy and nasty looking. These sure make my old pickup look good again. Great price, perfect fit.
Look like new OEM.
Dennis
January 4, 2018
Very satisfied with this new complete light kit. The lights are nice and bright. Transformed my truck, looks new on the front. You will have to adjust them to aim correctly. They were all out of whack. I highly recommend these for the price mostly.
Great value & product
Richard
January 20, 2018
Between a great product & a video that shows you how to remove & install all two front head light & turning lights . Simple step by step awesome. All lights fit as well as if they were from the factory, when it was built! If I ever need any future parts I will check with A1Auto first ! Thanks you again great product
Top notch!
David
January 21, 2018
Loved.the lighting kit. Fit perfectly no problems. AND the price was right. Good job guys and gals!
headlight replacement
G
May 29, 2018
Fast shipping and a great deal on this 4 pc headlight / parking light replacement. I got 360000 miles out of the original ones so hopefully I can get that on these. The headlight bulbs came with it but no bulbs for the parking lights as noted on the product description. I'm happy
Perfect
Benjamin
August 6, 2018
Perfect fit for my 2000 gmc sierra 1500, packaged very well, It made my truck look new again and barely had to adjust them. Would highly recommend
GMC Yukon headlights
C
August 12, 2018
good fit, very similiar to OE quality. Would recommend
Video and Product Five Star
G
August 27, 2018
Hard to describe in 50 characters how much quality there is in 1Aauto video and product. Further, I called for assistance and it was also Five Star attention and assistance.
2007 GMC Headlight assembly
P
October 12, 2018
Just what I ordered, part came in earlier than expected, the headlight assembly for 2007 GMC truck fit perfectly.
T
October 16, 2018
Nice easy to install fit good. Dont try and clean old ones. Buy these
2002 GMC Sierra Headlight and parking light kit
Jerry
October 25, 2018
Good shipping, they were packed well and arrived quickly. I have not installed these yet but they appear to be good quality fixxtures. 4 out of 5 because I have not installed the yet.
Satisfied
W
November 25, 2018
Great service ,fits well for aftermarket replacements. A 1 Rocks
Great headlight kits
Vance
November 26, 2018
The headlight kits fit well and appear to be of good quality, however only time will tell. Will be hard to compare to OEM components but if they last 1/2 as long will be a good deal
Perfect
Douglas
December 19, 2018
First time 1A Auto Customer. VERY satisfied with ease of finding correct part AND with shipment and fit! Couldn't have asked for anything to go better.
I'll be looking to use 1A Auto again for my next parts purchase.
Doug S
Great parts, great customer service. I will be back!
Walter
February 9, 2019
The headlight assemblies on my son's 2000 GMC Sierra Z-71 were very hazy and were providing terrible light which made it unsafe for him to drive. I ordered these lights from 1A Auto and they came quickly. I called customer service to inquire about adding LED bulbs to these assemblies and the gentleman was very helpful. He gave me great advice and I decided to try to old bulbs first before replacing them. He dissuaded me from upgrading to LEDs with these assemblies due to high heat levels.
My son installed them quickly and re-used the old bulbs. The improvement was amazing! He said it's like having brand new headlights. Thanks for the help. Great parts that fit perfectly. Great customer service. I will be back...
Nice fit good quality
M
February 10, 2019
Bought these for my 2000 GMC I was looking to save money they fit like oem the quality is 7/10 the fitment is 9/10 & very easy to install the only thing i dislike was the tabs on the inside of the headlight where the light bulb goes Into there very slim and a different style compared to OEM. If your looking to stay within budget on a good look to replace those old yellow lights this is the way to go!
GMC Lighting 4pc. kit.
William
February 11, 2019
I am very pleased with the replacement headlight and parking light lense kit I purchased. The fit was perfect and they are crytal clear. Makes the front of my truck look like new again and improves my visibility greatly. Would highly recommend for changing out those dulled, yellowed lenses.
Great fit
GREG
February 11, 2019
These lights fit as good or better than the factory lights. I will definitely go to 1aauto.com in the future for my truck part needs !!! Highly recommend everyone give them a try.
Head light and blinker replacement
M
February 13, 2019
I am very happy with my purchase I have purchased running parts and other parts from one a auto and I am very happy with all my purchases and your staff and your help very well knowledgeable in the ocean and the sea in your videos are very helpful I watch them when I need to know something about cars or other things on the Eagles you guys are very helpful and appreciated You guys have a great videos and all its replacement parts I am very happy Write your review here. It must be at least 50 characters long. Consider whether you would recommend this product and what you like or dislike about it.
Headlights
Mark
May 3, 2019
They look great but the adjusters were not working they seemed to be striped , I switched the headlight adjusters from the OEMs they were in my truck and they work fine now
George
June 11, 2019
all good.
Head and turn signals
R
July 18, 2019
excellent fit and good looking was very satisfied
Good stuff
D
August 26, 2019
I like these lights!
Good buy
Frank
August 28, 2019
This set of headlights was a good price. Fast delivery. I sold the truck spur of the moment, returned the lights. Easy return and fast refund. Will shop again at 1Aauto.
Good quality
Marc
August 29, 2019
Nice OEM looking lights. Factory adjusters bolted right up, I chose to use the factory over the ones supplied. For the money you can't go wrong, shipped quickly and very well packaged!
As Stated
Paul
September 6, 2019
Great buy, prompt delivery. Flawless purchase.
Nice bright headlights again
Scott
October 17, 2019
Great product. Fast delivery. Will order from 1aauto again.
Made in Taiwan
C
November 4, 2019
These are absolute garbage. The lock down rings for the bulbs were loose so my bulbs wouldn't lock. I took the mounting brackets off to tighten them up and all but one of the screws were stripped out. Once back together I had trouble getting them into the truck, one of the pin holes on each didn't line up with the other side in. Driver headlight points at the ground 30 feet in front of the truck, the passenger side blinds oncoming traffic. Both are adjusted to match what came out of the truck. Look for an OEM set of lights, not these Chinese knock offs. Garbage!
Headlight set
Kiley
January 14, 2020
The new headlights and running lights look fantastic on our truck. We however still had to take it to a mechanic shop to have the headlights adjusted correctly. Since I am a novice regarding headlights, I had no idea this had to be done until nightfall fell and the lights were not illuminating the road sufficiently. Since they have been adjusted, they work and look great.
Affordable head light set
Charles
January 25, 2020
Great head lights much brighter than my factory set.
Bracket broke in a week
C
February 2, 2020
The back of the headlights are made of a brittle material that breaks easily and should be made of plastic
Major Difference
W
March 6, 2020
My lights showed up on time and fit very well. Ive had them in the truck for a couple weeks now and its a huge improvement over my old ones. I tried the headlight clean/buff kits but didnt help much. I see so much better and the front of the truck looks like new too.
Thank You for Your Excellent Customer Service
Justin
April 22, 2020
excellent products at an excellent price! Their customer service is beyond compare. They are very literate and experts in their field of industry! With sincere admiration, Justin R.
Replacement front lights 2005 GMC Yukon XL
A
May 31, 2020
I received my order of the 4 piece headlight set in a few days after placing my order. Each item was packaged very well and all the contents was in tact. What a difference it made on my 15 year old truck! Especially at nite, I could really see the road clearly even in the pouring rain. When your headlamps start clouding over, just replace them, you will clearly see the difference, and the fit was perfect!
Headlight review
N
July 5, 2020
Was first time in ordering from A1 Auto and got the GMC headlight kit was very pleased! They are a snap to assemble no pun intended they were beautiful and work great!! Would recommend A1 Auto to friends and family in fact already have!
2002 GMC headlights
Rodney
September 23, 2020
Fit perfect and fast shipping
I will be using A1 for all my need
Ronald
September 29, 2020
The lights came so far out of adjustment I couldn't get them installed, once I figured that out, the pins fell into place. Don't force them, do some preadjusting.
Headlight
L
October 13, 2020
These were delivered fast and worked great
Better Visibility
M
October 15, 2020
My factory 2006 2500HD lenses were shot and nighttime visibility was poor. These are a great improvement and at a reasonable price. Be aware that if you have the rubber gasket around the perimeter of the headlight lenses there are no tabs on these to hold it in place. I used Gorilla Tape in place of the tabs and it's working well so far. The bulbs don't lock in real well in these either so I had to add a gasket around the socket to keep the bulbs from vibrating loose. Both simple fixes, but certainly not OEM quality and not OEM price either.
Easy swap out.
V
October 29, 2020
Replaced original assembly with these. Easy swap
Worked perfectly
S
November 22, 2020
Direct fit replacement. Had to adjust prior to install to keep from breaking mounting points, but then went in great.
Headlights
D
December 4, 2020
The 4 pack was a easy stall, looks crystal clear, shipping was quick.
The set mounts are casted somewhat cheap.
Overall great product
Super happy with my purchase
Joseph
January 26, 2021
I would definitely recommend this product. They look clean. Solid build quality. They have a solid fit in the truck. I am happy with the product I got and the price I paid.
Tight
Frank
April 30, 2021
Running light quick and easy. The head lights took much longer to get the rod through. Had to ream out the holes a little too make fit. Still tight enough that I dont have any vibration in them.
Broken Attachment Tab
scott
May 11, 2021
While I was really initially impressed with the look and fit... not more than 3 days later, I found the left headlamp loose - the cause was a broken attachment tab. Not one of the adjustable ones, but the permanent mount tab. Luckily I noticed it early in the day, and as I work at at night, I had to remove the whole assembly so I could epoxy the tab back on, and get it back together later that evening. I attribute the break to a poor factory molding process which seemed a little thin at the breakage point. The right headlight is fine, but I went ahead and threw some epoxy around that tab also. I've installed quite a number of headlight assemblies and other automotive trim and body parts over the years so this was in no way a rookie installation. I won't say "You get what you paid for...", 'cause in no way were these "low cost", but they weren't $400 factory OEM's either, but my money is as hard earned as any other car/truck guys is.
Nice quality lights
Maurice
May 14, 2021
After reading several reviews I decided on 1A for these lights. They are perfect fit for my 2003 Sierra and installed same as original. I don't expect to see any bracket break as other brand reviews stated. Quick ship and packaged well. Get these. Happy buyer. MAGA
I would recommend anyone looking for this product buy from 1aauto
Randy
July 30, 2021
Im very satisfied with the purchase of the headlights/turn signal lights. I received them sooner than expected and installation was easy!
Exact fit, looks remarkable
Mark
August 8, 2021
Perfect fit and they look great, exactly like the original ones. Made a remarkable improvement to the look of the vehicle.
Jeff
August 18, 2021
Replacement part work perfectly!
Timothy
October 11, 2021
They look great
Great
Jake
October 15, 2021
Very high quality
Nice and Bright Again!
Nathan
October 20, 2021
What a great improvement and refresh of my old lights... my Yuke looks almost new again!!!
Nice
James
October 21, 2021
I installed these on my 2005 GMC Serria. Great fit and looks great!
David
October 23, 2021
Ike always comes quick and is always good quality equipment.
Fits and looks great for my 2007 GMC Sierra Classic 1500 V8 4.8L . Great price and comes with new headlight lamps and bright light lamps which I didn't even know it came with those bulbs when I purchased the housing for them
Full Headlight Set for 2002 GMC Sierra 2500HD.
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George
November 15, 2021
I bought these for my 2002 GMC Sierra 2500hd truck. They were a perfect fit. They looked just like the ad, Crystal clear. They make a big difference in the way the truck looks and allow the headlights to actually light up the road now.
2000 GMC Sierra 1500 replacement head lights
Peter
November 26, 2021
Great fit! Easy Installation that took about 10 minutes per side! Great Price! Highly recommend!
The new lights look great and are so much brighter of course, than the old ones that were OEM parts on a 2002 vehicle.
Good Fit
Steven
December 15, 2021
Packaged well and fit perfectly.
Kevin
December 23, 2021
shipping on time, fit perfect look great
Very pleased
Timothy
December 25, 2021
Fit just like the originals. My set included new headlamp bulbs so that was nice. I'm pleased with price and service of 1A Auto and their videos are very helpful.
Love it
Rogelio
January 1, 2022
Love it, they fit perfectly.
great
WILLIAM
January 2, 2022
the lights them self looked go
but was not the ones for my truck
Good product
Joe
January 7, 2022
Worked exactly as I wanted. Easy to install. Looks 100% than the old set.
2004 gmc sierra
Daniel
January 10, 2022
The headlights are clear and improve the looks. They do have the problem of lining up with the outside pin when putting them back in. I had to be very careful not to break them and it took a little time to get them to go. The parking lights already have water in them and that has blown one of the marker lights. I'm going to remove it and try to place silicon around the seal and then replace the light. These lights are made in China, but what isn't these days.
Darren
January 13, 2022
Fresh look all the way!!!!
Disappointing purchase
Gabe
January 14, 2022
These lights install just fine but they definitely dont sit in the housing like the factory OEM headlights. I spent several hours trying to adjust them but no matter the adjustment, they just didnt look right. I ended up refinishing the OEM headlights and putting them back in and they look way better than these that I purchased. I threw them right in the trash! Sorry 1A Auto. Im still a customer of yours, but I wont be buying headlights from you again in the future.
Not as good as I had expected.
Joel
February 2, 2022
They look like the original. The fit isn't even close. The lock pins are near impossible to get thru. Also the beam pattern is nowhere near what the original is. These don't throw the light very well even with the better Silver star Ultra bulbs.
Mark
February 10, 2022
I returned it, not because of quality or fit. There is a rubber weather seal that surrounds the head light piece and keeps water and road grime out the the chamber. It relies on tabs around the unit to keep the seal in place, which your product in place. I was able to find what I needed on other sites and ordered from such.I found that they were not the quality of yours and the adjusters actually broke during installation. Needless to say they also went back. At this time Im just going with the Gm replacements (ouch !) . In closing I have used your products before and will do so again. I have been very pleased with your service and quality. For you to note everyone from your costumer service were very helpful and polite
Terry
April 13, 2022
6 months later one of the lights has moisture in it.
Perfect
LeRoy
April 29, 2022
Easy install and perfect fit.
Andrew
July 6, 2022
Makes my truck look like new.
Let there be light
John
August 18, 2022
Fit fine, no problems.
Bill
August 26, 2022
Great prices and items fit like a glove
Perfect fit. Looks like new.
Maurice
August 28, 2022
Perfect fit. Looks like new.
Ok for the price.
Arnoldo
September 16, 2022
Looks like a good product. We'll see how long they last. Originally headlights had a rubber seal on the outer part of the headlight. Assuming it was to cover gapping and possibly for wind. The seal didn't fit around these lights. I mean doesn't look bad with out the seals
Peter
April 28, 2023
Fantastic
mark
December 1, 2023
looks NEW again Thank you.
Perfect?
Charles
December 15, 2023
Good product, easy to install and the shipping was spot on?
Didn't last.
Dan
May 4, 2024
Headlamp broke again on the passenger side.
Customer Q&A
After installing the headlights in the headlight kit, do I have to get the headlight aim checked?March 13, 2016
Dennis S
10
Everything lined up perfectly so I didn't have to adjust anything but I'm not sure about any others it might have been the luck of the draw. Install and see if it's to your liking
March 13, 2016
Daniel T
10
I did not, it worked fine.
March 13, 2016
Robert H
10
Yes
March 13, 2016
Kenneth B
10
Probably so, I had to adjust mine a little.
March 13, 2016
Greg S
10
I did with my vehicle
March 13, 2016
Gregory V
10
Chances are that you will need to have it aligned properly
March 13, 2016
Jennifer E
10
Yes I did .They were of just a little
March 13, 2016
Kevin S
10
Yes, get the aim checked. After installing mine, the aim was off slightly. I was high beam flashed a couple of times before setting the aim correctly.
March 14, 2016
John P
10
May need some tweaking to get perfect but should be pretty close out of the box
March 14, 2016
Brian F
10
yes, i would recommend you do for optima lighting at night
March 14, 2016
David M
10
As a rule, you should always check alignment after install...There will always be slight variances in the parts...
March 14, 2016
Chris B
How do you adjust the lights?August 6, 2017
L S
10
If you have a gmc or chev you would use the std adjustment that are on the truck or car
August 7, 2017
Charles B
10
I didnt have to do much adjustment just a turn or so on the adjusting screws on the back of the light
August 7, 2017
Paul W
10
same as the old ones with a trox driver
December 11, 2017
Dale S
10
Didn't have to do any adjustment.
March 23, 2021
John M
Does it come with lights inside lenses?April 1, 2020
Justin R
10
Yes
April 1, 2020
Weston H
10
Just plug in and drive.
April 1, 2020
M A
10
These lights do not include bulbs. If you happen to receive a product with bulbs, the bulbs are for testing and not covered under our warranty. Our warranty applies to the light assembly only. Thanks for the inquiry!
April 1, 2020
Andra M
Will they fit a 2004 GMC Sierra SLE?September 13, 2021
John D
10
Yes, this part will fit your vehicle.
September 13, 2021
Emma F
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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