1999 GMC Envoy Owner's Manual - Page 283
1999 GMC Envoy Manual
Page 283 highlights
yellowblue Front Turn Signal Lamp Assembly 1. Remove the headlamp assembly as shown under "Composite High-Beam Headlamp System" earlier in this section. 5. Turn the bulb assembly counterclockwise to remove it. 6. Put the new bulb assembly into the headlamp assembly and turn it clockwise until it is tight. 7. Plug in the electrical connector. 8. Put the headlamp assembly back into the vehicle. Install the two retaining clips. 2. Twist the bulb socket to remove it from the headlamp assembly. 3. Pull the bulb straight out to remove it from the socket. 4. Push the new bulb into the socket until it snaps into place. 6-33