2004 GMC Sierra 1500 Pickup Owner's Manual - Page 473

4. Pull the old bulb straight out from the socket. 5. Press a new bulb into the socket and turn the socket clockwise into the taillamp housing. 6. Reinstall the rear lamp assembly. 7. Close the tailgate. 1. Using your hands, peel the rubber seal away from the lens. 2. Lift the lens off the lamp assembly. 3. Pull the old bulb straight out from the socket. 4. Put a new bulb into the socket and press it in until it is tight. 5. Reinstall the lens and the lens seal. Taillamps (Chassis Cab Models) A. Turn Signal Lamp B. Stoplamp C. Back-up Lamp 5-73