Chevrolet 2003 Avalanche Owner's Manual page 379

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CAUTION:
Using a match near a battery can cause battery
gas to explode. People have been hurt doing
this, and some have been blinded. Use a
flashlight if you need more light.
Be sure the battery has enough water. You
don't need to add water to the ACDelco
battery installed in your new vehicle. But if a
battery has filler caps, be sure the right
amount of fluid is there. If it is low, add water
to take care of that first. If you don't, explosive
gas could be present.
Battery fluid contains acid that can burn you.
Don't get it on you. If you accidentally get it in
your eyes or on your skin, flush the place with
water and get medical help immediately.
5-46
5. Check that the jumper cables don't have loose or
missing insulation. If they do, you could get a
shock. The vehicles could be damaged too.
Before you connect the cables, here are some
basic things you should know. Positive (+) will go to
positive (+) or to a remote positive terminal (+) if
the vehicle has one. Negative (−) will go to a heavy,
unpainted metal engine part or to a remote
negative (−) terminal, if the vehicle has one.
Don't connect positive (+) to negative (−) or you'll
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get a short that would damage the battery and
maybe other parts too.
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CAUTION:
Fans or other moving engine parts can injure
you badly. Keep your hands away from moving
parts once the engine is running.