GMC 2004 Defense Owner's Manual page 38

This procedure applies only to the underhood battery
located on the passenger's side of the vehicle.
1. Get the vehicles close enough so that jumper cables
can reach, but be sure the vehicles are not touching
each other. If they are, it could cause a ground
causing the vehicle not to start. The bad grounding
could damage the electrical systems.
To avoid the possibility of the vehicles rolling, set
the parking brake firmly on both vehicles involved in
the jump start procedure. Put the automatic trans-
mission in PARK (P). Be sure the transfer case is
in a drive gear and is NOT in NEUTRAL (N).
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 are not required 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, there is a risk that they could be badly
damaged. The repairs will not be covered by the warranty.
3. 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 if the vehicle has one.
4. Open the hood and locate the battery. Find the
positive (+) and negative (-) terminals on each
battery.
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