GMC 2002 Envoy - Manual (Page 287)

5-3
Jump Starting
If your battery has run down, you may want to
use another vehicle and some jumper cables to start
your vehicle. But please use the following steps to
do it safely.
CAUTION:
Batteries can hurt you. They can be
dangerous because:
D They contain acid that can burn you.
D They contain gas that can explode or ignite.
D They contain enough electricity to
burn you.
If you don’t follow these steps exactly, some or all
of these things can hurt you.
NOTICE:
Ignoring these steps could result in costly damage
to your vehicle that wouldn’t be covered by
your warranty.
The ACDelco
R
battery in your vehicle has a
built - in hydrometer. Do not charge, test or jump
start the battery if the hydrometer looks clear
or light yellow. Replace the battery when there
is a clear or light yellow hydrometer and a
cranking complaint.
Trying to start your vehicle by pushing or pulling
it won’t work, and it could damage your vehicle.
1. Check the other vehicle. It must have a
12 - volt battery with a negative ground system.
NOTICE:
If the other system isn’t a 12 - volt system with a
negative ground, both vehicles can be damaged.