GMC 1999 Sierra 1500 Pickup Owner's Manual page 336

Service & Amearance Care
5. Put the new bulb into the socket, gently press in on the bulb and turn it
clockwise until it is tight.
6. Put the socket back into the light assembly and turn it clockwise until
it
locks.
7. Put the parkinghurn signal light assembly back into the vehicle and
tighten the screws.
Side Marker Bulb
I I
K2683
1. Remove the screws and pull out the parkinghurn signal light assembly.
2. Reach through the opening and turn the side marker bulb socket
counterclockwise and remove it.
3. Pull the bulb straight out of the socket.
4.
Put a new bulb into the socket and push it in until it is tight.
5. Put the socket back into the side marker assembly and turn
it
clockwise
to tighten it.
6. Replace the parkinghurn signal light assembly and tighten the screws.
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