Buick 1993 LeSabre Owner's Manual page 201

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A
CAUTION:
You could be injured if the vehicles roll. Set the
parking brake firmly on each vehicle. Put an
automatic transaxle in "P" (Park) or a manual
transaxle in "N" (Neutral).
3. Turn off the ignition on both vehicles. Turn off all
lights that aren't needed, and radios. This will avoid
sparks and help save both batteries. And it could
save your radio!
If
you leave your radio on,
It
could be m y
damaged. The repairs wouldn't be covered by
your warranty.
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4. Open the hoods and locate the batteries.
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A
CAUTION:
An electric fan can start up even when the engine
is not running and can injure you. Keep hands,
clothing and tools away from any underhood
electric fan.
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Find the positive
(+)
and negative
(-)
terminals on each
battery.