Cadillac 2003 CTS Owner's Manual page 303

10. Now start the vehicle with the good battery and run
the engine for a while.
11. Try to start the vehicle that has the dead battery.
If it won't start after a few tries, it probably
needs service.
NOTICE:
Damage to your vehicle may result from
electrical shorting if jumper cables are removed
incorrectly. To prevent electrical shorting, take
care that the cables don't touch each other or any
other metal period. The repairs wouldn't be
covered by your warranty.
5-8
Jumper Cable Removal
A. Dead Battery
B. Good Battery
C. Heavy, Unpainted Metal Engine Part