Buick 1993 Skylark Owner's Manual page 193

Don't let the other end touch anything until the next
step. The other end of the negative cable doesn't go to
the dead battery. It goes to a heavy unpainted metal part
on the engine of the vehicle with the dead battery.
9. Attach the cable at least 18 inches (45 cm) away
from the dead battery, but not near engine parts that
move. The electrical connection is just as good there,
but the chance of sparks getting back to the battery is
much less.
10. Now start the vehicle with the good battery and run
the engine for awhile.
11. Try to start the vehicle with the dead battery.
If it won't start after a few tries, it probably needs
service.
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12. Remove the cables in reverse order to prevent
electrical shorting. Take care that they don't touch
each other or any other metal.