Hummer 2003 H2 Owner's Manual page 309

9. Connect the other end of
-
the negative ( ) cable to
-
the remote negative (
terminal, marked GND,
on the vehicle with the
dead battery.
10. Now start the vehicle with the good battery and
run the engine for awhile.
)
11. Try to start the vehicle with the dead battery.
If it won't start after a few tries, it probably needs
service.
NOTICE:
Damage to your vehicle may result from
electrical shorting if jumper cables are removed
incorrectly. To prevent electrical shorting, take
care that they don't touch each other or any
other metal. The repairs wouldn't be covered by
your warranty.
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