Dual Function (Third Brake Light Bed Cargo & Reverse) Wiring Harness | 2019-2025 Silverado & Sierra
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This will get the center high mount stop lamp (CHMSL) cargo lights on your Silverado or Sierra to work as both a cargo light and a reverse lamp. This will also enable your rear-facing tailgate cargo light (if equipped) to come on in reverse. The truck's cargo lights will also illuminate when you unlock the truck with the key fob at night as a courtesy lamp. The installation is very easy and takes less than 5 minutes while following our installation video.
Important Note: This harness will not activate your tow mirror cargo lights in reverse. If you'd like your tow mirror cargo lights to come on in reverse, you will need to purchase a supplemental cargo and reverse harness HERE.
This product fits the following vehicles (Including T1 New Body Style and Duramax diesel):
| Vehicle fitment | Fitment note |
| 2025 Chevy Silverado 1500 | |
| 2025 GMC Sierra 2500/3500 | |
| 2025 GMC Sierra 1500 | |
| 2025 Chevy Silverado 2500/3500 | |
| 2024 Chevy Silverado 1500 | |
| 2024 Chevy Silverado 2500/3500 | |
| 2024 GMC Sierra 1500 | |
| 2024 GMC Sierra 2500/3500 | |
| 2023 GMC Sierra 2500/3500 | |
| 2023 GMC Sierra 1500 | |
| 2023 Chevy Silverado 1500 | |
| 2023 Chevy Silverado 2500/3500 | |
| 2022 GMC Sierra 1500 (Refreshed) | |
| 2022 Chevy Silverado 1500 (Refreshed) | |
| 2022 Chevy Silverado 2500/3500 | |
| 2022 GMC Sierra 1500 LTD | |
| 2022 Chevy Silverado 1500 LD | |
| 2022 GMC Sierra 2500/3500 | |
| 2021 Chevy Silverado 1500 | |
| 2021 GMC Sierra 1500 | |
| 2021 Chevy Silverado 2500/3500 | |
| 2021 GMC Sierra 2500/3500 | |
| 2020 Chevy Silverado 2500/3500 | |
| 2020 GMC Sierra 1500 | |
| 2020 Chevy Silverado 1500 | |
| 2020 GMC Sierra 2500/3500 | |
| 2019 GMC Sierra 1500 | |
| 2019 Chevy Silverado 1500 |
Link to Install Application A (3:52): https://youtu.be/uXQqv4QkbBc
Application A applies to the following vehicles:
- 2019-2021 Chevy Silverado 1500
- 2019-2021 GMC Sierra 1500
- 2020-2023 Chevy Silverado 2500/3500
- 2020-2023 GMC Sierra 2500/3500
- 2022 Chevy Silverado 1500 LD
- 2022 GMC Sierra 1500 LTD
Link to Install Application B (3:29): https://youtu.be/YnniromfCkc
Application B applies to the following vehicles:
- 2022-2025 Chevy Silverado 1500 Refreshed
- 2022-2025 GMC Sierra 1500 Refreshed
- 2024 - 2025 Chevy Silverado 2500/3500
- 2024 - 2025 GMC Sierra 2500/3500
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FAQ
This is very easy to install and takes less than 10 minutes to install.
Yes, as long as it is dark outside. The cargo lights will only illuminate if the ambient light sensor senses that it's dark outside.
This modification only activates the center high mount stop lamp and tailgate cargo lights in reverse.
If you would like your mirror cargo lights to be activated in reverse as well first add this to your cart, then add our cargo and reverse harness to your cart by CLICKING HERE. These harnesses can be used in tandem - just stagger the taps on any shared wires.
This modification only activates them in reverse.
If you would like to have them activated in drive as well first add this to your cart, then add our cargo in drive harness to your cart by CLICKING HERE. These harnesses can be used in tandem - just stagger the taps on any shared wires.
Why Choose Boost Auto?
Reviews
Customer Reviews
4.9 Based on 101 Reviews
Customer Photos
- Reviews
- Questions
Filter Reviews:
NP
02/18/2025
Nick P.
United States
Boost review
Bought all three components for my 23 GMC 2500 and could not be happier with product and delivery
CK
02/12/2025
chris k.
United States
Boost nails it again
Easy install Easy on my pocket And works great
ZG
02/12/2025
Zapo G.
United States
Awesome product!
It took 5 minutes to install it was super easy and the 3rd brake light being on while in reverse not only does it give it a nice look it’s also super useful!
PW
02/08/2025
Patrick W.
United States
Third Brake Light Bed Cargo & Reverse Install
The item itself is very easy to install and use. Boost Auto did an amazing job going over everything you would need to know through their YouTube videos to put the part in correctly.
DB
01/15/2025
David B.
United States
Great as always!
Watched the installation video. Just as stated, about 10 minutes to install! Just ordered a couple of other items!