Pontiac 2007 G5 Owner's Manual page 306

See Engine Compartment Overview on
page 278 for more information on the location
of the positive (+) and negative ( ) terminals
on your vehicle.
CAUTION:
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An electric fan can start up even when the
engine is not running and can injure you.
Keep hands, clothing and tools away from
any underhood electric fan.
306
The remote negative ( )
ground terminal, marked
GND ( ), is located
behind the engine
coolant surge tank.
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 don't,
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.