How to Replace Tail Light Combination Junction Block 99-04 GMC Sierra 2500
Difficulty: Beginner · About 20 min · Gmc Sierra
Replace the tail light combination junction block on a 1999-2004 GMC Sierra 2500.
Tools you will need
- 13mm socket
- Flat blade screwdriver
- Rust penetrant
- Ratchet
Parts and supplies
- Tail light combination junction block
Steps
- Remove the old junction block
Disconnect all the harnesses from it, remove the 13mm bolt securing its bracket to the frame, pull the bracket free, then pry the tab on the back of the bracket to slide the junction out.
- Install the new junction block
Slide it into the bracket, feed the bracket back into place, replace the 13mm bolt, then reconnect the harnesses.
Check your vehicle’s repair manual for exact specifications and fit.