Pontiac Montana SV6 2007 Owner's Manual page 450

CAUTION:
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Using a match near a battery can cause
battery gas to explode. People have been
hurt doing this, and some have been
blinded. Use a flashlight if you need
more light.
Be sure the battery has enough water. You
do not need to add water to the battery
installed in your new vehicle. But if a
battery has filler caps, be sure the right
amount of fluid is there. If it is low, add
water to take care of that first. If you do
not, explosive gas could be present.
Battery fluid contains acid that can
burn you. Do not get it on you. If you
accidentally get it in your eyes or on your
skin, flush the place with water and get
medical help immediately.
450
CAUTION:
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Fans or other moving engine parts can
injure you badly. Keep your hands away
from moving parts once the engine is
running.
5. Check that the jumper cables do not have
loose or missing insulation. If they do, you
could get a shock. The vehicles could
be damaged too.
Before you connect the cables, here are some
basic things you should know. Positive (+) will
go to positive (+) or to a remote positive (+)
terminal if the vehicle has one. Negative (−) will
go to a heavy, unpainted metal engine part or to
a remote negative (−) terminal if the vehicle has
one. Do not connect positive (+) to negative (−)
or you will get a short that would damage the
battery and maybe other parts too. Do not
connect the negative (−) cable to the
negative (−) terminal on the dead battery
because this can cause sparks.