Chevrolet 2004 Silverado 1500 Pickup Owner's Manual page 462

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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.
3. Press the release tab,
if equipped, and turn
the bulb socket
counterclockwise to
remove it from
the taillamp housing.