Upgrading the 1999 GMC Sierra 1500 Cargo Light to LED atoallinks.com

Insert the new LED bulb. Note that LEDs are polarity-sensitive; if the light does not illuminate when you test it, simply remove the bulb, rotate it 180 degrees, and reinsert. Reattach the lens cover, ensuring all clips snap securely into place. Test the cargo light using the dash-mounted switch or by opening a door (the cargo light often activates with the dome light circuit). The difference is striking: the LED produces a brilliant, wide beam that floods the entire truck bed, from the cab to the tailgate. No more squinting or reaching for a handheld flashlight.