The Complete Guide for Upgrading 2005 GMC Sierra 1500 Headlights to LED morsunled.mybloghunch.com

After removing all three bolts, carefully pull the headlight assembly straight forward. Disconnect the main wiring harness plug by pressing the release tab. Before installing your new LED assembly, test all functions by temporarily connecting it to the factory harness and reconnecting the battery. Verify low beam, high beam, and parking light operation. If you experience flickering or hyper-flashing, install any included anti-flicker modules or CAN bus decoders according to the manufacturer's instructions. Once confirmed working, disconnect the battery again, secure the new assembly with the three 10mm bolts (hand-tighten only—overtightening can crack the mounting tabs), and carefully route any excess wiring into the engine bay.