GMC Sierra 3500HD 2001 Owner's Manual page 167

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 batteries have enough water. You
don't need to add water to the ACDelco
(or batteries) installed in every new GM 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.
6. 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 (+) and negative (
unpainted metal engine part. Don't connect
positive (+) to negative (
would damage the battery and maybe other parts too.
R
battery
On vehicles equipped with dual batteries, make any
battery connections to the primary battery located on
the passenger's side of the vehicle.
Fans or other moving engine parts can injure you
badly. Keep your hands away from moving parts
once the engine is running.
-
) will go to a heavy,
-
) or you'll get a short that
CAUTION:
5-5