OPERATOR'S MANUAL

Electrical System Preventive Maintenance
– 222 – Y53-6027
Medium Duty (R05/09)
Jump Starting Vehicles
Because of the various battery installations and optional
electrical systems, Peterbilt does not recommend that you
attempt to jump start your vehicle. If you have a battery prob-
lem, it is best to contact a Peterbilt Dealer or a reputable tow-
ing service.
However, if your battery is discharged (dead), you may be
able to start it by using energy from a good battery in another
vehicle. This is termed “jump starting.” Be sure to follow the
precautions and instructions below.
WARNING! Batteries contain acid that can burn
and gases that can explode. Ignoring safety pro-
cedures can cause you or others to be killed or
badly hurt.
WARNING! Never jump start a battery near fire,
flames, or electrical sparks. Batteries generate
explosive gases that could explode causing
death or serious personal injury. Keep sparks,
flame, and lighted cigarettes away from batter-
ies.
WARNING! Do not allow battery fluid to contact
eyes, skin, fabrics, or painted surfaces. Always
wear eye protection. Battery acid that may spill
during charging should be washed off with a
solution of warm water and baking soda to neu-
tralize the acid. If you accidentally get acid in
your eyes or on your skin, immediately rinse
with cold water for several minutes and call a
doctor.
•Be careful that metal tools (or any metal in con-
tact with the positive terminal) do not contact
the positive battery terminal and any other metal
on the vehicle at the same time. Remove metal
jewelry and avoid leaning over the battery.
•If metal jewelry or other metal comes in contact
with electrical circuits, a short circuit may occur
causing death or serious personal injury, as well
as electrical system failure and damage to the
vehicle.
•Do not try to jump start or charge a frozen bat-
tery. (Even a battery with ice particles on the
electrolyte surface is dangerous.) Allow it to
thaw out first. And always allow the battery to
thaw gradually—do not apply direct heat. Gas
trapped in the ice may cause an explosion.