1ALTL00929-Chevrolet GMC Cadillac Hummer Tail Light Combination Junction Block
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Chevrolet GMC Cadillac Hummer Tail Light Combination Junction Block Dorman 923-012


Tail light Combination Junction Block
$ 35.95
$41.95
14% OFF
$41.95
14% OFF
FREE SAME DAY SHIPPING
Dorman
923-012
In Stock
Part 1ALTL00929

Orders must be placed by 2pm ET
Part 1ALTL00929
In Stock
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Deliveries made to PO Boxes and FPO may take longer. See our Shipping & Delivery for more information.

Frequently bought together

Description

Vehicle Fit

Warranty & Shipping
How-To & Tools

Assemblies include test bulbs that should be replaced before installation.

Item Condition: New

Attention California Customers:

WARNING:  This product can expose you to chemicals including Butyl benzyl phthalate (BBP)d, which is known to the State of California to cause 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 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.

FREE Shipping is standard on Orders shipped to the lower 48 States (Contiguous United States). Standard shipping charges apply to Hawaii, Alaska and US Territories.  Shipping is not available to Canada.

Expedited is available on checkout to the United States, excluding Alaska, Hawaii and US Territories as well as P.O. Boxes and APO/FPO/DPO addresses.  Final shipping costs are available at checkout.

How to Replace Tail Light Combination Junction Block 99-04 GMC Sierra 2500

Created on: 2011-01-17

Watch to see how you can replace the taillight harness junction block on a 99-04 GMC Sierra 2500 as well as on many other GM trucks.

  1. step 1 : Removing the Taillight Harness Junction
    • Disconnect all of the harnesses from the junction block.
    • Remove the 13mm bolt that secures the block to the frame.
    • Pull the bracket free.
    • Pry out the tab on the back of the bracket and slide the junction out of the bracket.
  2. step 2 : Replacing the Taillight Harness Junction
    • Slide the junction into the bracket.
    • Feed the bracket back up into place.
    • Replace the 13mm bolt.
    • Reconnect the harnesses

Tools needed for replacement

  • Materials, Fluids, and Supplies

    Rust Penetrant

  • Ratchets & Related

    Ratchet

  • Screwdrivers & Related

    Flat Blade Screwdriver

  • Sockets - Metric

    13mm Socket

Installation Video
Watch video

Fits these Makes

Year Make Model Description
2003-2006Cadillac Escalade ESV Cadillac Escalade ESV Tail Light Combination Junction Block
2002-2006Cadillac Escalade EXT Cadillac Escalade EXT Tail Light Combination Junction Block
2003-2006Chevrolet Avalanche 1500 Chevrolet Avalanche 1500 Tail Light Combination Junction Block
2003-2006Chevrolet Avalanche 2500 Chevrolet Avalanche 2500 Tail Light Combination Junction Block
1999-2014Chevrolet Silverado 1500 Chevrolet Silverado 1500 Tail Light Combination Junction Block
2007Chevrolet Silverado 1500 Classic Chevrolet Silverado 1500 Classic Tail Light Combination Junction Block
2001-2003Chevrolet Silverado 1500 HD Chevrolet Silverado 1500 HD Tail Light Combination Junction Block
2005-2006Chevrolet Silverado 1500 HD Chevrolet Silverado 1500 HD Tail Light Combination Junction Block
2007Chevrolet Silverado 1500 HD Classic Chevrolet Silverado 1500 HD Classic Tail Light Combination Junction Block
1999-2004Chevrolet Silverado 2500 Chevrolet Silverado 2500 Tail Light Combination Junction Block
2001-2014Chevrolet Silverado 2500 HD Chevrolet Silverado 2500 HD Tail Light Combination Junction Block
2007Chevrolet Silverado 2500 HD Classic Chevrolet Silverado 2500 HD Classic Tail Light Combination Junction Block
2001-2006Chevrolet Silverado 3500 Chevrolet Silverado 3500 Tail Light Combination Junction Block
2007Chevrolet Silverado 3500 Classic Chevrolet Silverado 3500 Classic Tail Light Combination Junction Block
2007-2014Chevrolet Silverado 3500 HD Chevrolet Silverado 3500 HD Tail Light Combination Junction Block
2002-2006Chevrolet Suburban 1500 Chevrolet Suburban 1500 Tail Light Combination Junction Block
2002-2004Chevrolet Suburban 2500 Chevrolet Suburban 2500 Tail Light Combination Junction Block
1999-2014GMC Sierra 1500 GMC Sierra 1500 Tail Light Combination Junction Block
2007GMC Sierra 1500 Classic GMC Sierra 1500 Classic Tail Light Combination Junction Block
2001-2003GMC Sierra 1500 HD GMC Sierra 1500 HD Tail Light Combination Junction Block
2005-2006GMC Sierra 1500 HD GMC Sierra 1500 HD Tail Light Combination Junction Block
2007GMC Sierra 1500 HD Classic GMC Sierra 1500 HD Classic Tail Light Combination Junction Block
1999-2004GMC Sierra 2500 GMC Sierra 2500 Tail Light Combination Junction Block
2001-2014GMC Sierra 2500 HD GMC Sierra 2500 HD Tail Light Combination Junction Block
2007GMC Sierra 2500 HD Classic GMC Sierra 2500 HD Classic Tail Light Combination Junction Block
2001-2006GMC Sierra 3500 GMC Sierra 3500 Tail Light Combination Junction Block
2007GMC Sierra 3500 Classic GMC Sierra 3500 Classic Tail Light Combination Junction Block
2007-2014GMC Sierra 3500 HD GMC Sierra 3500 HD Tail Light Combination Junction Block
2002-2006GMC Yukon GMC Yukon Denali Tail Light Combination Junction Block
2002-2006GMC Yukon XL 1500 GMC Yukon XL 1500 Tail Light Combination Junction Block
2002-2006GMC Yukon XL 2500 GMC Yukon XL 2500 Tail Light Combination Junction Block
2003-2009Hummer H2 Hummer H2 Tail Light Combination Junction Block

Part Interchange

Brand Label Part Number
DIY Solutions LHT06239

This item may be interchangeable with parts from other brands with the above part numbers. This information is provided only for reference and does not guarantee that the item you are purchasing is identical to parts with part numbers from the brands listed above. To confirm that this item fits your vehicle, use the above "Check Vehicle Fit" option.

Dorman
923-012
In Stock
Part 1ALTL00929
Product Reviews
Loading reviews
4.72/ 5.0 18
Perfect Fit
N
July 2, 2017
They Sent It Really Fast To Me I Had A Back Up Light Out This Fixed My Back Up Light That Was Out Also It Was A Perfect Fit
Matthew
September 11, 2017
Exactly as advertised. Was a perfect fit from the factory replacement.
Great product
Randy
October 3, 2017
Great product, good quality, easy installation !!!!!!!!
Junction block
Michael
March 25, 2018
Product was delivered fast and came just as advertised. Thanks so much!
M
April 5, 2018
Received quickly and part fits perfect will order from you guys again any day and have already recommended you to friends and family
faulty
G
July 7, 2018
unit did not work properly , my mechanic had to troubleshoot and then by pass the wiring on one side
good service, another happy camper!
shelley
August 17, 2018
Just the piece I needed, and fast delivery service was a bonus. I would recommend your 1A auto parts supply store to all my friends. We were able to change the part and head of on our holidays in record time. Thanks for being reliable
K
September 4, 2018
Product fit and work as it should delivery was on time and I'm very happy with the company
Problem Solver for Truck and Trailer Lighting
Robert
September 10, 2018
I've had issues with truck electrics on my 04 Silverado and use it to haul a 3 horse Sundowner gooseneck trailer. This part came to my attention via an email from 1A Auto. The information in the email seemed to describe some of the issues I was having with my truck. And of course, there was a YouTube video from 1A Auto that showed how simple this repair is to perform. Ordered the part, usual speedy delivery, problem solved!
Great Price. Gsst Shipping
Julius
November 6, 2018
The price for my part was the best I found. The part came fast. Best of all it was a perfect fit. Excellent all the way around. Thanks!!
quick and easy transaction
Kirk
November 30, 2018
Ordering from 1A Auto was easy and received the part quickly!
Direct replacement
Dillon
February 11, 2019
Replaced the factory junction block flawlessly. Only issues I ran into had nothing to do with this part. My driver side tail light/brake like stopped working and new bulbs didn't fix it. Best price on the internet for this piece and it's actually quite a simple job thanks to their tutorial videos.
Alvin
May 15, 2019
Piece of mind when dealing with these guys.
Easy-Peasy
John
July 16, 2019
The part was spot on. The easier way to change is just slightly flex the metal compression tabs and remove one screw. It slides out nicely and lets you clean the frame behind it. Reverse the process to reinstall, put the plugs in their respective spots and your done. Works great.
Satisfied customer
Joseph
August 9, 2019
Works perfectly
Great product
B
August 13, 2019
Great price, easy to install.
Tail light junction box
Daryl
April 2, 2020
Fit perfectly fixed problem and installation video was spot on Thank you
Great product
L
November 7, 2020
Great prices as well. Looked all over and couldn’t find this anywhere
Customer Q&A
stop light on trailer connects to it too ?
October 24, 2015
10
Donald, I have not installed it yet. I wrecked the truck and just gotten it back from repairs. You may have an answer before I complete the job. Let me know what you find out. Lincoln W.
October 24, 2015
10
Junction box
October 24, 2015
10
If your truck has the factory trailer connects, it should.
October 24, 2015
10
BElieve it does. 4 plugs. 1 for left 1 for right 1 coming front of truck. 4th should be 7 wire rv plug.
October 24, 2015
Can this junction box cause issues with lights on my camper?
June 4, 2017
10
Fixed my right truck taillight and same side 5th wheel taillight
June 4, 2017
10
Yes if the contacts are corroded. I would check the receptive on the trick side first and work your way forward. I just spent hours t-shooting mine to find the contacts in the 7 pin recepticle we're corroded
June 5, 2017
10
This is possible as the power to the turn signals for both truck and trailer are combined.
June 5, 2017
10
hello i don't have a camper, i have Chevrolet Silverado,, this junction box fixed my rear light issue
June 7, 2017
Does this junction block have anything to do with trailer lights?
June 14, 2017
10
Not really sure. Friend was having issues with thier taillights.
June 14, 2017
10
Yes. All the rear lights plug into the junction block.. each connection has uts own tab configuration so they can not be mixed up...you can find the block mounted with one screw on the cross member of the frame anove the spare tire..
June 14, 2017
10
Yes, all of the power to the rear lights will travel through this block.
June 14, 2017
10
Iam not sure because i no longer have a trailer
June 15, 2017
10
All the rear lighting passes through the junction block. if it fails NO LIGHTS!
June 16, 2017
10
not realy but a convenient place to check fore voltage
June 22, 2017
Do you have a wiring diagram for the feed wires to this block?
March 2, 2019
10
We do apologize but we do not have the wiring diagram.
March 2, 2019
Does replacing this tail light junction block fix a rapid blinking signal light ?
October 26, 2020
10
There could be multiple reasons why you're having this particular problem. We suggest taking your vehicle to a nearby reputable shop to identify the cause. Once you know the cause, we'll be happy to see if we carry the parts and how-to videos needed for your repair.
October 26, 2020
My 03 Silverado 1500hd L Rear Tail lamp won't come on, changed the bulb, flipped the bulbs, checked the fuses, Break light comes on, side running/blinker only works on blinker mode not running mode. Checked lines for cracks or cuts, zip. Checked th
January 7, 2021
10
There could be multiple reasons why you're having this particular problem. We suggest taking your vehicle to a nearby reputable shop to identify the cause. Once you know the cause, we'll be happy to see if we carry the parts and how-to videos needed for your repair.
January 7, 2021
Would this have anything to do with my rear parking sensors? They don’t work and I’ve tried everything except this? Thanks
April 7, 2021
10
This is the junction block for the lights, so they would not have anything to do with rear parking sensors.
April 7, 2021
Customer service

877-844-3393

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Saturday - Sunday 8:00am - 4:30pm ET


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