1999-2006 GMC Sierra LED DRL Bulbs: Looking for upgraded LED DRL Bulbs from a reputable brand and value the fact that we've actually tested them on your truck? Our HR Tested kits include all the right components to ensure perfect fit, function, and performance from the upgrade. At Headlight Revolution, we do 1999-2006 GMC Sierra LED lighting upgrades better!

The Armor Series of LED bulb: is impressively bright, with an unparalleled Black-Chrome style. The white is one of the brightest bulbs we offer, and the other colors are vibrant and impressive. The Armor series look great on and off, so if you're looking for a super bright option that also looks cool, you've found the right option!

Using state of the art: 2835 SMD LED chips to produce unparalleled light output with high-efficiency power usage! The focusing lens on top creates a 165 degree beam pattern output and the decorative metal style of the bulb surrounding is an excellent heat sink. This means we can push these LEDs to the limit without risk of damaging them from heat! Get ready for an amazing bulb that will last a very long time.

Constant Current Driver: The Armor Series of LED bulbs from GTR Lighting are built using a state of the art Constant Current Driver inside the bulb. This allows them to be more reliable when used on vehicles that have voltage fluctuations due to electrical system design or fault. A constant current driver is a device that takes any incoming voltage and smooths it o+C301ut, regulates it, so a steady stream of voltage/current reaches the LED. This helps the LED bulb last longer than bulbs that don't have this device built in.

When installing: LED bulbs to replace your factory blinker bulbs, you will have a "fast flash" or "hyperflash" problem. This means the vehicle will think you have a light bulb burnt out and, as an indicator to you, will flash quicker than normal. Installing these resistors will fool your vehicle into thinking it has a light bulb in good condition installed and will blink normally. Simply wire the resistor between the ground wire and the blinking positive wire.

WARNING!: The resistors get hot! It is very important to mount them to something metal behind the headlights with screws, not zip ties. The resistors get so hot they can melt some light plastic and short wires. Keep them away from all wiring and heat sensitive materials!

HR Tested: Here at Headlight Revolution, we've spent the time to install and test all HR Tested products, so we know it'll work exactly as shown and right out of the box! Not only that, but we don't favor one particular brand. We just deliver the best product for the application, period. Be sure to reference our install videos for helpful tips on making the installation process quick, painless, and clear. HR Tested: We ensure fitment and function. You do the install. For other compatible upgrades, use the Buyers Guide on our homepage!