Menu

1A Auto Video Library
Our how-to videos have helped repair over 100 million vehicles

How to Replace Tail Lights 04-06 GMC Sierra

Share on:
  1. step : Removing the Tail Light (0:50)
    • Lower the tailgate
    • Remove the two 10mm bolts on the side of the tail light assembly
    • Pull the light out, twist out the bulbs
    • Unplug the wiring harness
  2. step : Installing the New Tail Light (2:05)
    • Transfer the wiring to the new tail light
    • Twist in the bulbs
    • Plug in the wiring harness
    • Insert the tail light into place
    • Insert the two 10mm bolts
    • Close the tailgate

Brought to you by 1AAuto.com, your source for quality replacement parts and the best service on the internet.

Hi, I'm Mike Green. I'm one of the owners of 1A Auto. I want to help you save time and money repairing or maintaining your vehicle. I'm going to use my 20-plus years experience restoring and repairing cars and trucks like this to show you the correct way to install parts from 1AAuto.com. The right parts installed correctly: that's going to save you time and money. Thank you and enjoy the video.

In this video we're going to show you how to replace the taillight, either replace the taillight bulb or the procedure for replacing the entire tail light. The only tool you'll need is a 10mm wrench or a socket wrench with ratchet and maybe a pair of pliers and a flat-blade screwdriver.

Starting with your tailgate, open there are two 10mm bolts on each side for each light. You want to remove those 10mm bolts. We'll just kind of speed through removing those. You can use a 10mm wrench or a socket and ratchet like I have.

Once you have those bolts out, pull it firmly. If you're looking to just change your bulbs, turn them counterclockwise. The socket comes out. The bulbs just pull out of the sockets. Your harness goes down into there. Up underneath you want to unplug your connector. There's a tab right here. You press and unplug. Then the connector is held onto the frame. You have to pull it off. Then this clip here that holds the harness on, you pull that off as well. You can get that from 1A Auto. It comes with everything including a harness and plug.

You see my old light is perfectly fine. I'm not going to go through all that changing out of the harnesses and stuff. To reinstall, I'll move it into place and make sure these tabs go into here and then down there as well. We'll fast-forward again as I thread those bolts in by hand first. I might have to push on the light a little bit to get the holes to line up. Tighten them up with the socket by hand. Then tighten them up firm with the ratchet.

We hope this helps you out, brought to you by www.1AAuto.com, your source for quality replacement parts and the best service on the internet. Please feel free to call us toll free 888-844-3393. We're the company that's here for you on the internet and in person.

Tools needed for replacement:

    Ratchets & Related

  • Ratchet

  • Sockets - Metric

  • 10mm Socket

2001 - 2003  Chevrolet  Silverado 3500
2001 - 2003  GMC  Sierra 3500
1999 - 2003  GMC  Sierra 1500
1999 - 2002  Chevrolet  Silverado 1500
1999 - 2002  Chevrolet  Silverado 2500
1999 - 2003  GMC  Sierra 2500
2001 - 2003  GMC  Sierra 1500 HD
2001 - 2002  Chevrolet  Silverado 1500 HD
2001 - 2002  Chevrolet  Silverado 2500 HD
2001 - 2003  GMC  Sierra 2500 HD
2004 - 2006  GMC  Sierra 1500
2004 - 2006  GMC  Sierra 3500
2004 - 2006  GMC  Sierra 2500 HD
2004 - 2004  GMC  Sierra 2500
2007 - 2007  GMC  Sierra 2500 HD Classic
2007 - 2007  GMC  Sierra 1500 Classic
2005 - 2006  GMC  Sierra 1500 HD
2007 - 2007  GMC  Sierra 1500 HD Classic
2007 - 2007  GMC  Sierra 3500 Classic
1999 - 2000  GMC  Sierra 1500
2001 - 2001  GMC  Sierra 1500
2002 - 2003  GMC  Sierra 1500
2002 - 2002  GMC  Sierra 1500
2005 - 2006  GMC  Sierra 1500
2003 - 2003  Chevrolet  Silverado 3500
Search Videos
Go To Top


Same Day Shipping

Orders ship same day when ordered by 2pm ET. Need your part faster? Choose expedited shipping at checkout.


Guaranteed To Fit

Providing you the highest quality, direct fit replacement auto parts enforced to the strictest product standards.


USA Customer Support

Exceeding customers' expectations every day, our team of passionate auto enthusiasts are here to help.


Instructional Video Library

Thousands of how-to auto repair videos specific to year, make and model guide you step-by-step through your repair.

Loading...