GMC 2002 Sierra - Manual (Page 413)

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Vehicle Storage
If you’re not going to drive your vehicle for 25 days or
more, remove the black, negative (
- ) cable from
the battery. This will help keep your battery from
running down.
CAUTION:
Batteries have acid that can burn you and gas
that can explode. You can be badly hurt if you
aren’t careful. See “Jump Starting” in the Index
for tips on working around a battery without
getting hurt.
Contact your dealer to learn how to prepare your vehicle
for longer storage periods.
Also, for your audio system, see “Theft - Deterrent
Feature” in the Index.
Bulb Replacement
For any bulb changing procedure not listed in this
section, contact your dealer.
See “Replacement Bulbs” in the Index for the proper
types of bulbs to use.
Halogen Bulbs
CAUTION:
Halogen bulbs have pressurized gas inside and
can burst if you drop or scratch the bulb. You or
others could be injured. Be sure to read and
follow the instructions on the bulb package.