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This installation reference covers 2020-2021 GMC Sierra 2500/3500 HD DRL Boards. Match the product, vehicle configuration and controller part number before starting.
Product Link: 2020-2021 GMC Sierra 2500/3500 HD DRL Boards
Step 1: Test your Product. This helps you check operation and confirm the wiring before permanent installation. See the wiring guide that comes with your product or visit our Wiring Guide.
Step 2: Remove your bumper to access headlights.
Step 3: Open your headlights. (*Confirm the opening and resealing method for your exact housing before following the video below)
Step 4: Install your LED Product into your headlights.
Step 5: Reseal your headlights (see video above) or click here for full guide.
Step 6: If you haven't already, wire your LED Product onto your car using the included wiring guide or see our general wiring guide.
Additional installation videos
These earlier demonstrations may show a different controller revision. Use the current kit-specific wiring instructions above for your supplied hardware.
Source and installation help
Checked against GMC Sierra 2500/3500 HD DRL Boards (2020-2021) Install Guide in the RGB Halo Kits Help Center on October 22, 2026. Follow the instructions supplied with your exact kit if hardware versions differ.
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