GMC 2006 Sierra - Manual (Page 464)

Vehicle Storage
If you are 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
are not careful. See Jump Starting on page 5-52
for tips on working around a battery without
getting hurt.
Jump Starting
If your vehicle’s battery (or batteries) has run down, you
may want to use another vehicle and some jumper cables
to start your vehicle. Be sure to use the following steps to
do it safely.
{ CAUTION:
Batteries can hurt you. They can be dangerous
because:
• They contain acid that can burn you.
• They contain gas that can explode or ignite.
• They contain enough electricity to burn you.
If you do not follow these steps exactly, some or
all of these things can hurt you.
5-52