GMC Sierra 2010 Owner's Manual page 491

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
transmission in P (Park) or a manual transmission
in Neutral before setting the parking brake. If you
have a four-wheel-drive vehicle, be sure the
transfer case is in a drive gear, not in Neutral.
Notice: If you leave the radio or other accessories
on during the jump starting procedure, they could
be damaged. The repairs would not be covered by
the warranty. Always turn off the radio and other
accessories when jump starting the vehicle.
4. Turn off the ignition on both vehicles. Unplug
unnecessary accessories plugged into the
cigarette lighter or the accessory power outlets.
Turn off the radio and all the lamps that are not
needed. This will avoid sparks and help save
both batteries. And it could save the radio!
5. Open the hood on the other vehicle and locate the
positive (+) and negative ( ) terminal locations on
that vehicle.
The positive (+) terminal, is located under a
red plastic cover at the positive battery post.
To uncover the positive (+) terminal, open the
red plastic cover.
The remote negative ( ) terminal is a stud located
on the right front passenger side of the engine,
where the negative battery cable attaches. See
Engine Compartment Overview on page 6 16.
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