GMC 1993 Safari Owner's Manual page 212

Good
Batfery
Dead Battery
K3507
10. Now start the vehicle with the good battery and run the engine
for
11. Try to start the vehicle with the dead battery.
awhile.
If it won't start after a few tries, it probably needs service.
OEAD BATTERY
REMOVE CABLES IN THIS ORDER
K1508
12.
Remove the cables in reverse order to prevent electrical shorting. Take
care that they don't touch each other or any other metal.
5-6