GMC 2012 Savana Owner's Manual page 336

10. Try to start the vehicle that had
the dead battery. If it will not
start after a few tries, it
probably needs service.
A. Unpainted Metal Part or Remote
Negative ( ) Terminal
B. Good Battery or Remote
Positive (+) and Remote
Negative ( ) Terminals
C. Dead Battery or Remote
Positive (+) Terminal
To disconnect the jumper cables
from both vehicles, do the following:
1. Disconnect the black
negative ( ) cable from the
vehicle that had the dead
battery.
2. Disconnect the black
negative ( ) cable from the
vehicle with the good battery.
3. Disconnect the red positive (+)
cable from the vehicle with the
good battery.
4. Disconnect the red positive (+)
cable from the other vehicle.
5. Return the remote positive (+)
terminal cover to its original
position.