Replaces

Tail Light Combination Junction Block Dorman 923-012 - 1ALTL00929

Description
Warranty & Shipping
How-To & Tools
Product Reviews
Q&A
Vehicle Fit

This replacement tail light Combination Junction Block is just what you need to get your GM Full Size Truck in good working order again!

This junction block connects the rear body harness to both Tail light harnesses and license plate light harness. It is mounted on the rear frame rail behind the rear bumper. Due to this location, it is constantly exposed to the elements of rain, road debris, salt, & snow. Since it is electrical, this can cause it to corrode and then stop functioning. Many Tail light electrical problems are because of this junction block malfunctioning.

Specifications:

  • Replaces dealer part number: 15304995
  • Direct replacement
  • Built to strict quality control standards
  • Mounts on rear frame rail

Note: This GM Full Size Truck tail light combination junction block makes a great replacement and could help solve many electrical problems!

Bulb Note:

Unless otherwise noted, our lights do not include bulbs, though occasionally lighting manufacturers do include bulbs in the lights. If you happen to receive a lighting product (Headlight, Tail light, parking light, fog light etc.) that comes with the bulbs, the bulbs are not covered under our warranty. Our warranty applies only to the light assembly.

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 a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

  1. step : Removing the Taillight Harness Junction (0:53)
    • 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 : Replacing the Taillight Harness Junction (4:09)
    • 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

4.64/ 5.0
11 reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
10
0
0
0
1
Perfect Fit
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
July 2, 2017
Exactly as advertised. Was a perfect fit from the factory replacement.
September 11, 2017
Great product
Great product, good quality, easy installation !!!!!!!!
October 3, 2017
Junction block
Product was delivered fast and came just as advertised. Thanks so much!
March 25, 2018
Received quickly and part fits perfect will order from you guys again any day and have already recommended you to friends and family
April 5, 2018
faulty
unit did not work properly , my mechanic had to troubleshoot and then by pass the wiring on one side
July 7, 2018
good service, another happy camper!
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
August 17, 2018
Product fit and work as it should delivery was on time and Im very happy with the company
September 4, 2018
Problem Solver for Truck and Trailer Lighting
Ive 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!
September 10, 2018
Great Price. Gsst Shipping
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!!
November 6, 2018
quick and easy transaction
Ordering from 1A Auto was easy and received the part quickly!
November 30, 2018
Will this fit my car? Add a vehicle to make sure
Customer Q&A
Ask a question to 1A Auto customers who purchased the product
stop light on trailer connects to it too ?
Donald C October 24, 2015
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.
Lweinc L October 24, 2015
Junction box
Douglas N October 24, 2015
If your truck has the factory trailer connects, it should.
Dale G October 24, 2015
BElieve it does. 4 plugs. 1 for left 1 for right 1 coming front of truck. 4th should be 7 wire rv plug.
William R October 24, 2015
Can this junction box cause issues with lights on my camper?
Jared F June 4, 2017
Fixed my right truck taillight and same side 5th wheel taillight
James T June 4, 2017
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 were corroded
Michael I June 5, 2017
This is possible as the power to the turn signals for both truck and trailer are combined.
Alex P June 5, 2017
hello i dont have a camper, i have Chevrolet Silverado,, this junction box fixed my rear light issue
Miguel P June 7, 2017
Does this junction block have anything to do with trailer lights?
Colton M June 14, 2017
Not really sure. Friend was having issues with thier taillights.
Gregorio M June 14, 2017
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..
David D June 14, 2017
Yes, all of the power to the rear lights will travel through this block.
Alex P June 14, 2017
Iam not sure because i no longer have a trailer
S M June 15, 2017
All the rear lighting passes through the junction block. if it fails NO LIGHTS!
Daniel N June 16, 2017
not realy but a convenient place to check fore voltage
David M June 22, 2017
Year Make Model Description
2003-2006Cadillac Escalade ESV Cadillac Escalade ESV Tail Light Combination Junction Block Dorman 923-012
2002-2006Cadillac Escalade EXT Cadillac Escalade EXT Tail Light Combination Junction Block Dorman 923-012
2003-2006Chevy Avalanche 1500 Chevy Avalanche 1500 Tail Light Combination Junction Block Dorman 923-012
2003-2006Chevy Avalanche 2500 Chevy Avalanche 2500 Tail Light Combination Junction Block Dorman 923-012
1999-2014Chevy Silverado 1500 Chevy Silverado 1500 Tail Light Combination Junction Block Dorman 923-012
2007Chevy Silverado 1500 Classic Chevy Silverado 1500 Classic Tail Light Combination Junction Block Dorman 923-012
2001-2003Chevy Silverado 1500 HD Chevy Silverado 1500 HD Tail Light Combination Junction Block Dorman 923-012
2005-2006Chevy Silverado 1500 HD Chevy Silverado 1500 HD Tail Light Combination Junction Block Dorman 923-012
2007Chevy Silverado 1500 HD Classic Chevy Silverado 1500 HD Classic Tail Light Combination Junction Block Dorman 923-012
1999-2004Chevy Silverado 2500 Chevy Silverado 2500 Tail Light Combination Junction Block Dorman 923-012
2001-2014Chevy Silverado 2500 HD Chevy Silverado 2500 HD Tail Light Combination Junction Block Dorman 923-012
2007Chevy Silverado 2500 HD Classic Chevy Silverado 2500 HD Classic Tail Light Combination Junction Block Dorman 923-012
2001-2006Chevy Silverado 3500 Chevy Silverado 3500 Tail Light Combination Junction Block Dorman 923-012
2007Chevy Silverado 3500 Classic Chevy Silverado 3500 Classic Tail Light Combination Junction Block Dorman 923-012
2007-2014Chevy Silverado 3500 HD Chevy Silverado 3500 HD Tail Light Combination Junction Block Dorman 923-012
2002-2006Chevy Suburban 1500 Chevy Suburban 1500 Tail Light Combination Junction Block Dorman 923-012
2002-2004Chevy Suburban 2500 Chevy Suburban 2500 Tail Light Combination Junction Block Dorman 923-012
1999-2014GMC Sierra 1500 GMC Sierra 1500 Tail Light Combination Junction Block Dorman 923-012
2007GMC Sierra 1500 Classic GMC Sierra 1500 Classic Tail Light Combination Junction Block Dorman 923-012
2001-2003GMC Sierra 1500 HD GMC Sierra 1500 HD Tail Light Combination Junction Block Dorman 923-012
2005-2006GMC Sierra 1500 HD GMC Sierra 1500 HD Tail Light Combination Junction Block Dorman 923-012
2007GMC Sierra 1500 HD Classic GMC Sierra 1500 HD Classic Tail Light Combination Junction Block Dorman 923-012
1999-2004GMC Sierra 2500 GMC Sierra 2500 Tail Light Combination Junction Block Dorman 923-012
2001-2014GMC Sierra 2500 HD GMC Sierra 2500 HD Tail Light Combination Junction Block Dorman 923-012
2007GMC Sierra 2500 HD Classic GMC Sierra 2500 HD Classic Tail Light Combination Junction Block Dorman 923-012
2001-2006GMC Sierra 3500 GMC Sierra 3500 Tail Light Combination Junction Block Dorman 923-012
2007GMC Sierra 3500 Classic GMC Sierra 3500 Classic Tail Light Combination Junction Block Dorman 923-012
2007-2014GMC Sierra 3500 HD GMC Sierra 3500 HD Tail Light Combination Junction Block Dorman 923-012
2002-2006GMC Yukon GMC Yukon Denali Tail Light Combination Junction Block Dorman 923-012
2002-2006GMC Yukon XL 1500 GMC Yukon XL 1500 Tail Light Combination Junction Block Dorman 923-012
2002-2006GMC Yukon XL 2500 GMC Yukon XL 2500 Tail Light Combination Junction Block Dorman 923-012
2003-2009Hummer H2 Hummer H2 Tail Light Combination Junction Block Dorman 923-012
Part #: 1ALTL00929


Order must be placed by 4pm ET

Get it in: 2 - 4 Business Days

Want it sooner? Choose Next Day Air at Checkout

Dorman
Brand #: 923-012

How-to Video:

(05:55 min)