1999 GMC Sonoma Owner's Manual - Page 278

yellowblue 3. Remove the bulb. Taillamps 1. Open the tailgate. 2. Remove the screws from the lamp assembly near the tailgate latch. 4. Install a new bulb. 5. Replace the lens. Install and tighten the screws. If equipment such as a cap or camper is installed on your vehicle, a center high-mounted stoplamp feed wire is provided along the driver's side rear frame. This wire should be used to install a center high-mounted stoplamp in the cap or camper. 3. Pull the assembly away from the pickup side panel. 4. Turn the socket counterclockwise to remove it. Push the tab in while you turn the socket. 5. Pull the bulb out. 6. Push the new bulb into the socket. 7. Put the socket into the assembly and turn the socket clockwise until it locks in place. 8. Replace the assembly. Install and tighten the screws. 9. Close the tailgate. 6-40