GMC 1996 Sierra Owner's Manual page 296

4. Pull the old bulb straight
out of the socket..
5 .
6.
7.
8.
Put in a new bulb and push it in until it is tight.
Replace the bulb retainer.
Replace the rear lamp assembly and tighten
the screws.
Close the tailgate.
Taillamps (Chassis Cab Models)
1. Using your hands, peel the rubber seal away from
the lens.
2. Lift the lens off the
lamp assembly.
3. Slide the socket out of the lamp assembly.
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