GMC 2003 C4C042 Owner's Manual page 231

CAUTION:
Fans or other moving engine parts can injure you
badly. Keep your hands away from moving parts
once the engine is running.
5. Check that the jumper cables don't have loose or
missing insulation. If they do, you could get a shock.
The vehicles could be damaged, too.
Before you connect the cables, here are some basic
things you should know. Positive (+) will go to
positive (+) or to a remote positive (+) terminal if
the vehicle has one. Negative (
unpainted metal engine part or to a remote
-
negative ( ) terminal if the vehicle has one.
Don't connect the positive (+) to negative (
you'll get a short that would damage the battery and
maybe other parts too. And don't connect the
-
negative ( ) cable to the negative (
dead battery because this can cause sparks.
5-6
-
) will go to a heavy,
-
) or
-
) terminal on the
6. Connect the red
positive (+) cable
to the positive (+)
terminal of the
dead battery. Use a
remote positive (+)
terminal if the
vehicle has one.