Dual Function (Third Brake Light Bed Cargo & Reverse) Wiring Harness | 2019-2025 Silverado & Sierra
Choose options to update the price
Choose Your Options:
or SEE ALL COMPATIBLE PRODUCTS
- Ships Within 1-Business Day
- Ships Within 1-Business Day
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 |
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
Other products you might be interested in
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
- Reviews
- Questions
United StatesGreat as always!
Watched the installation video. Just as stated, about 10 minutes to install! Just ordered a couple of other items!
United StatesWorks on 2025 GMC Sierra 1500 AT4
Install was quick and easy literally took less than 10 minutes. I’m glad that there was also a video for installation instructions.
United StatesExact fit and speedy service
United StatesWorks great
Easy install maybe 5 minutes, works as advertised. It now turns on my cargo lights when in Reverse. Helps to provide a little more light in dark night.
United StatesWorks perfectly! This is how it should work from the factory