GMC 2008 Yukon XL Denali, Owner'S Manual, Page: 381 / 502

5. Check that the jumper cables do not 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.
Do not connect positive (+) to negative (
−
) or you
will get a short that would damage the battery and
maybe other parts too. And do not connect the
negative (
−
) cable to the negative (
−
) terminal on the
dead battery because this can cause sparks.
6. Connect the red
positive (+) cable to the
positive (+) terminal
of the vehicle with the
dead battery. Use a
remote positive (+)
terminal if the vehicle
has one.
7. Do not let the other end touch metal. Connect it to
the positive (+) terminal of the good battery. Use a
remote positive (+) terminal if the vehicle has one.
8. Now connect the black negative (
−
) cable to the
negative (
−
) terminal of the good battery. Use a
remote negative (
−
) terminal if the vehicle has one.
Do not let the other end touch anything until the
next step. The other end of the negative (
−
) cable
does not go to the dead battery. It goes to a heavy,
unpainted metal engine part or to the remote
negative (
−
) terminal on the vehicle with the dead
battery.
9. Connect the other end of the negative (
−
) cable to
the remote negative (
−
) terminal, on the vehicle with
the dead battery.
10. Now start the vehicle with the good battery and run
the engine for a while.
11. Try to start the vehicle that had the dead battery.
If it will not start after a few tries, it probably needs
service.
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