GMC 1998 Safari Owner's Manual page 298

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Vehicle Storage
Bulb Replacement
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.
A
CAUTION: - 1
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.
For any bulb changing procedure not listed in this
section, contact your GM dealer service department.
Before replacing any bulbs, make sure all lamps are off
and the vehicle is not running. See "Replacement Bulbs"
in the Index.
Halogen Bulbs
'a
Halogen bulbs have pressCzea g x inside and
can burst i f you drop or scratch the bulb. You or
others could be injured. Be sure to read and
follow the instructions on the bulb package.