GMC SIERRA 1997 Manual page 247

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7. Now connect the black
negative
(-)
cable to
the good battery's
negative
(-)
cable.
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 of the vehicle with the dead battery.
8. 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.
9. Now start the vehicle with the good battery and run
the engine for awhile.

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