2020-2025 GMC Sierra 2500/3500 Fender Lights - Smoked / Frosted
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Upgrade your 2020-2025 GMC Sierra 2500/3500 HD fender lights with these premium drop-in replacement fender marker lights from Boost Auto.
Offered as a direct replacement running light or an upgrade to running lights and turn signals, these lights offer more options than your factory setup. You can select our full-length LED option for more light output from your fender lights or choose the subtle yet bright look of our OEM-length LED lights. To add to the custom options, you can select these lights in a smoked lens if you would like to achieve a tinted look or in a frosted lens for a clearer light output. The offered options don't stop there, you can also select to have your full-length LED lights equipped with our unique start-up sequence for a sleek show truck look and to match the rest of your Boost Auto lighting on your truck.
These lights feature a completely plug-and-play design, meaning no cutting or splicing is required during installation, making it easier than ever to replace your existing OEM amber-color sidemarker lights and other aftermarket fender lights. Our kit comes with a wiring harness and detailed installation videos, guiding you step-by-step to ensure a hassle-free setup.
Not only do these lights offer tons of custom options and a seamless easy installation, but they also come with the quality that Boost Auto is known for. Using quality lighting for all our product lines to ensure that every light on your truck from Boost Auto matches in durability, light output, color temperature and time sequence.
These replace the factory lights which are part numbers 84185031 and 84806032.
Vehicle fitment | Fitment note |
- Detailed Installation Instructions Included (See Installation Tab)
- Sold as a set (4 Lights Included)
- Wiring Harness Included (When Adding Turn Signal)
- 1-year Warranty
- Item Condition: New
- Free Ground Shipping (Lower 48 States)
- Quality Checked in USA
Running Light Only: https://youtu.be/g4J_4HrVjww
Sequential Signal & Running Light: https://youtu.be/MEDGkdTQIb4
Sequential Switchback: https://youtu.be/MEDGkdTQIb4
Light Functions Overview

Running Light Only - Amber LED

Running Light Only - White LED

Signal & Running Light

Sequential Signal & Running Light

Switchback

Sequential Switchback
Start-Up Sequence Overview

White Start-Up Sequence

Amber Start-Up Sequence
FAQ
Yes, all versions of these lights are completely plug and play. There is absolutely no cutting or splicing required.
If you select the lights with the OEM Length LED, your lights will automatically come equipped with the start-up sequence.
If you select the lights with the Full Length LED, you can choose to opt in or out of having the start-up sequence.
The Running Light Only version takes approximately 1 hour to install following our installation video.
The turn signal versions take approximately 1–2 hours to install. An upgrade harness (completely plug and play) is required to be installed for these lights which is what takes a bit longer. We have a full installation video showing how to do the installation.
The price is for a SET of four lights (one for each fender).
If you're upgrading to the version with signals, the required wiring harness to connect to the truck is included.
These are exclusively offered by Boost Auto (we designed and developed the tooling), so we do not offer the lights individually because they will not match any other lights on the market.
Yes! Simply select that you would like to purchase the fender clip kit above and these clips will be included with your order. This kit will include all the fender clips you may need for your truck.
Yes! These work on dually trucks and use the same installation process. The only difference is that the rear fender liners have some adhesive material on them, so they're a bit more stubborn coming off.
Check out the dynamic pictures shown on the page above for an idea of how the lights will function.
If you choose Running Light Only - Amber LED, the lights will only work as an amber running light.
If you choose Running Light Only - White LED, the lights will only work as a white running light.
If you choose Signal & Running Light, the lights will illuminate as an amber running light and flash as an amber turn signal. Further explained, if you just have the running lights on, the light will be a solid amber strip. If you activate the turn signal while the running lights are on, the solid amber light will turn off, and the amber light will flash. After the signal turns off, the amber light will turn back on. If your running lights are off, the amber signal light will flash like a normal signal.
If you choose Sequential Signal & Running Light, the lights will illuminate as an amber running light and scan as an amber turn signal. Further explained, if you just have the running lights on, the light will be a solid amber strip. If you activate the turn signal while the running lights are on, the solid amber light will turn off, and the amber light will scan. After the signal turns off, the amber light will turn back on. If your running lights are off, the amber signal light will scan like a normal signal.
If you choose Switchback, the lights will illuminate as a white running light, and flash as an amber turn signal. Further explained, if you just have the running lights on, the light will be a solid white strip. If you activate the turn signal while the running lights are on, the solid white light will turn off, and the amber light will flash. After the signal turns off, the white light will turn back on. If your running lights are off, the amber signal light will flash like a normal signal.
If you choose Sequential Switchback, the lights will illuminate as a white running light and scan as an amber turn signal. Further explained, if you just have the running lights on, the light will be a solid white strip. If you activate the turn signal while the running lights are on, the solid white light will turn off, and the amber light will scan. After the signal turns off, the white light will turn back on. If your running lights are off, the amber signal light will scan like a normal signal.
The smoked lens is a smoked lens with a black plastic backing behind it.
The frosted lens is a frosted lens with a white plastic backing behind it.
The factory fender lights are running light only, so included with your purchase is a completely plug-and-play wiring harness. The harness intercepts the front headlight connectors and provides power to the fender lights.
The harness utilizes OEM connectors and is high quality. It is completely wrapped in high-temperature plastic protective tubing and requires no cutting or splicing whatsoever.
Absolutely. All of our products come standard with our 1-year warranty.
Why Choose Boost Auto?
Reviews
- Reviews
- Questions

Wicked Awesome
Ordered, they were delivered a few days later! Easy install! These were the second ones I’ve done so I stopped by the dealership to get some extra fender clips. About 10 of them broke. I wish they came with a set of fender clips.

Smoked finder marker lights
Shipping was fast and packaged perfect. I was able to watch video of install and had a smooth experience. Lights are quality and make the truck look amazing. The blinking fiction is classy and I am 100% satisfied.

Look great and work as advertised. Happy!
Easy install and quality product.

Side marker lights
Great, Online installation tutorial very good.

Haven’t installed them yet but the look and the quality of the parts looks fantastic