GMC Defense 2006 Owner's Manual Supplement page 50

3. Turn off the ignition on both vehicles. Unplug
unnecessary accessories plugged into the
cigarette lighter or accessory power outlets. Turn
off all lamps that are not required as well as
radios. This will avoid sparks and help save both
batteries. In addition, it could save the radio!
4. Ensure the jumper cables do not have loose or
missing insulation. If they do, you could get
shocked and the vehicle could be damaged.
Before you connect the cables, here are some
basic things you should know. Positive (+) will go
to positive (+). Negative (-) will go to a heavy,
unpainted metal engine part or a remote negative
(-) terminal. The remote negative terminal is
located on the engine drive bracket and is marked
GND (ground).
5. Open the hood and locate the battery. Find the
positive (+) and negative (-) terminals on each
battery.
CAUTION:
Using an open flame 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
batteries have enough water. You don't need to
add water to the Optima battery (or batteries)
installed in every new Military 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 the eyes or
on the skin, flush the place with water and get
medical help immediately.
CAUTION:
Fans or other moving engine parts can injure you
badly. Keep your hands away from moving part
once the engine is running.
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