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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 |
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.
PEOPLE WHO CARE
WE ARE PASSIONATE
TRUCK OWNERS
Our team is made of automotive enthusiasts who drive trucks and SUV's. We spend our weekends working on our own vehicles, which is how we're able to deliver the best technical support and DIY install guides. We've been in your shoes many times before.
Because our employees are enthusiasts, many of our product ideas come from things we want to put on our own vehicles.
WHY CHOOSE BOOST
We might be biased, but we think the choice is clear. Boost is better...because of this:
LIFETIME TECHNICAL SUPPORT
Our commitment to our customers never ends. Whether you call our technical support team 10 minutes after ordering or 10 years after ordering, you will receive the same high quality of attention & care.
HELPFUL INSTALL VIDEOS
We know bad instructions suck, that's why we don't offer a single product on our site that doesn't have a detailed tutorial video. These videos are filmed by enthusiasts so we make sure you get the info you need in an easy to understand format.
1 YEAR WARRANTY
All of our products come with a 1 year warranty. Vehicle manufacturer warranties are typically 36,000 miles but vehicles last 200,000+ miles. You can rest assured our products are designed to last the lifetime of your vehicle as well.
CUSTOMER REVIEWS
Customer Reviews
4.9 Based on 104 Reviews
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DB
01/15/2025
David B.
United StatesGreat as always!
Watched the installation video. Just as stated, about 10 minutes to install! Just ordered a couple of other items!
DS
01/15/2025
David S.
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.
C
12/30/2024
Clinton 
United StatesExact fit and speedy service
DG
12/28/2024
David G.
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.
T
12/03/2024
Travis
United StatesWorks perfectly! This is how it should work from the factory
QUALITY YOU CAN TRUST
All of our design & development, assembly & quality assurance takes place close to home, in our Northern Illinois Headquarters. Everything from 3D CAD design & prototyping to on-vehicle testing happens right here in America.
A PERFECT FIT
This ensures the accuracy of vehicle fitment across the entire range of trucks manufactured and sold in the United States
LOCAL SUPPORT
Plus, ALL of our support staff, ready to help you with your purchase, live here in West Chicago
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