GMC YUKON XL 2004 Owner's Manual page 430

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
5-50
To disconnect the jumper cables from both vehicles do
the following:
1. Disconnect the black negative ( ) cable from the
vehicle that had the bad battery.
2. Disconnect the black negative ( ) cable from
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 positive (+) remote terminal cover to its
original position.