Installing Sequential Turn Signals in the 1999 GMC Sierra 1500 Taillights morsunled.wordpress.com

Installation requires only basic hand tools and about 30 to 45 minutes. Begin by lowering the tailgate to access the two retaining screws securing each taillight housing—one upper and one lower . Use a Phillips screwdriver to remove these screws, then gently pull the taillight assembly straight out from the truck body. Be careful not to force it, as the factory harness is still connected. Disconnect the wiring harness by pressing the release tab and pulling the connector apart. Remove the three bulb sockets from the original housing and set aside the old assembly .