How to prevent mud/road salt/dirt from entering the rear tail light housing on a 2015 GMC Sierra? This is corroding the wiring harness that the bulb plugs into causing the bulbs to blow.

Asked by Mar 19, 2018 at 12:46 PM about the 2015 GMC Sierra 1500

Question type: Maintenance & Repair

2 Answers

40,845

RTV silicone. I've had to do this on several work vehicles in the past, especially vans with the third brake light mounted over the cargo doors that always seemed to leak water into vehicle. Change the bulbs, apply liberal amounts of dielectric grease, then seal with caulk.

Thanks Ken. My issue is the mud is coming in from the under the wheel well, which is getting flung into the holes attaching its self to the back of the rear tail light. So when I undo the 2 screws from the cabin bed and remove the tail light the entire back is covered in mud. Do you know what I could use to plug the holes to avoid the mud from getting in?

Your Answer:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,730
  • #2
    John Saffrahn
    Reputation
    4,100
  • #3
    Glenn Clingenpeel
    Reputation
    3,910
View All

Related Models For Sale

Used Chevrolet Silverado 1500
77 Great Deals out of 9,109 listings starting at $3,995
Used Ford F-150
129 Great Deals out of 12,617 listings starting at $3,895
Used GMC Sierra 2500HD
13 Great Deals out of 1,656 listings starting at $3,500
Used Chevrolet Silverado 2500HD
14 Great Deals out of 1,422 listings starting at $9,950
Used Ram 1500
254 Great Deals out of 26,495 listings starting at $8,500
Used Toyota Tundra
31 Great Deals out of 1,386 listings starting at $2,109
Used Toyota Tacoma
31 Great Deals out of 1,623 listings starting at $2,490
Used Ford F-250 Super Duty
20 Great Deals out of 874 listings starting at $5,999
Used Chevrolet Tahoe
11 Great Deals out of 1,011 listings starting at $4,999
Used GMC Yukon
19 Great Deals out of 1,150 listings starting at $4,750
Used Ram 2500
21 Great Deals out of 1,738 listings starting at $9,990
Used GMC Canyon
18 Great Deals out of 1,854 listings starting at $3,995
Used Chevrolet Colorado
14 Great Deals out of 2,117 listings starting at $3,995

Used Cars for Sale

2019 GMC Sierra 1500 For Sale
583 listings starting at $53,931
2018 GMC Sierra 1500 For Sale
8 Great Deals out of 5,438 listings starting at $26,375
2017 GMC Sierra 1500 For Sale
4 Great Deals out of 367 listings starting at $25,940
2016 GMC Sierra 1500 For Sale
11 Great Deals out of 329 listings starting at $18,995
2015 GMC Sierra 1500 For Sale
10 Great Deals out of 389 listings starting at $17,998

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.