GMC 2004 Defense, Owner'S Manual

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3. Locate the slave receptacles on both vehicles and
unscrew the cover.
2. Turn off the ignition on both vehicles. Unplug
unnecessary accessories plugged into the cigarette
lighter or accessory power outlets. Turn off all lamps
that aren’t needed as well as radios. This will avoid
sparks and help save both batteries. In addition, it
could save the radio!
Notice: If you leave the communications/navigation
equipment on, they could be badly damaged. The repairs
will not be covered by the warranty.
13895
Using a 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 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.
Fans or other moving engine parts can injure you
badly. Keep your hands away from moving parts once
the engine is running.
CAUTION:
CAUTION: