GMC 2005 Envoy Owner's Manual page 374

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.
5-42
5.3L V8 Engine
Notice: If the jumper cables are connected or
removed in the wrong order, electrical shorting may
occur and damage the vehicle. The repairs would
not be covered by your warranty. Always connect
and remove the jumper cables in the correct
order, making sure that the cables do not touch
each other or other metal.
Jumper Cable Removal
A. Heavy, Unpainted Metal Engine Part or Remote
Negative ( ) Terminal
B. Good Battery or Remote Positive (+) and Remote
Negative ( ) Terminals
C. Dead Battery or Remote Positive (+) Terminal