GMC 2006 Envoy Owner's Manual page 401

7. 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.
8. 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 the remote
negative ( ) terminal on the vehicle with the dead
battery. Your vehicle has a remote negative ( )
terminal, marked GND, for this purpose.
4.2L L6 Engine
The remote negative ( ) terminal is located on
the front engine lift bracket for the 4.2L L6 engine,
and on the accessory drive bracket for the
5.3L V8 engine.
9. Connect the other end of the negative ( ) cable to
the remote negative ( ) terminal on the vehicle with
the dead battery.
10. Now start the vehicle with the good battery and run
the engine for a while.
11. Try to start the vehicle that had the dead battery.
If it will not start after a few tries, it probably
needs service.
5.3L V8 Engine
5-45