GMC 2013 Sierra Denali Owner's Manual page 343

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To replace a taillamp assembly bulb:
1. Open the tailgate. See
for more
information.
2. Remove the two taillamp
assembly screws near the
tailgate latch.
3. Pull the taillamp assembly
rearward until the outer pins on
the taillamp assembly disengage
from the vehicle.
A. Stoplamp/Turn Signal Lamp/
Taillamp
B. Back-up Lamp
C. Sidemarker Lamp
4. Turn the bulb socket
counterclockwise to remove it
from the taillamp housing.
5. Pull the old bulb straight out
from the socket.
6. Press a new bulb into the socket
and turn the socket clockwise
into the taillamp housing.
7. Reinstall the taillamp assembly.
To replace one of these bulbs:
1. Remove the screws and lift off
the lamp assembly.

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