GMC 2012 Savana Owner's Manual page 335

6. Connect the red positive (+)
cable to the positive (+) terminal
of the dead battery. Use a
remote positive (+) terminal if the
vehicle has one. Do not let the
other end touch metal. Connect
it to the positive (+) terminal of
the good battery. Use a remote
positive (+) terminal if the vehicle
has one.
7. Now connect the black
negative ( ) cable to the
negative ( ) terminal of the
good battery. Use a remote
negative ( ) terminal if the
vehicle has one.
Do not let the other end touch
anything until the next step. The
other end of the negative ( )
cable does not go to the dead
battery. It goes to a heavy,
unpainted metal engine part or
to a remote negative ( ) terminal
on the vehicle with the dead
battery. On your van, use the
unpainted radio antenna bracket
as a remote negative ( )
terminal.
8. Connect the other end of the
negative ( ) cable to the
negative ( ) terminal location on
the vehicle with the dead battery.
On your van, use the unpainted
radio antenna bracket as a
remote negative ( ) terminal.
9. Now start the vehicle with the
good battery and run the engine
for a while.