GMC Sierra Denali 2014 Owner's Manual page 356

10-86 Vehicle Care
5.3L and 6.2L
To the metal bracket that is
bolted to the engine and
supports the resonator, on
the vehicle with the dead
battery.
6.0L
To the generator bracket, on
the vehicle with the dead
battery.
6.6L
To the negative ( ) post on
the auxiliary battery, on the
vehicle with the dead battery.
11. Start the vehicle with the good
battery and run the engine for a
while.
12. Try to start the vehicle that had
the dead battery. If it will not
start after a few tries, it
probably needs service.