Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

Preventive Maintenance
To Jump Start Your Vehicle
WARNING! The voltage of the booster battery
must have a 12–volt rating. And the capacity of
the booster battery should not be lower than
that of the discharged battery. Use of batteries of
different voltage or substantially different capacity
rating may cause an explosion and death or
serious personal injury.
CAUTION: Applying a higher voltage booster
battery will cause expensive damage to sensitive
electronic components, such as relays, and
the radio.
•Improper hook-up of jumper cables or not following
these procedures can damage the alternator
or cause serious damage to both vehicles.
WARNING! To avoid death, serious personal
injury and damage to the vehicle, heed all warnings
and instructions of the jumper cable manufacturer.
•The jumper cables must be long enough so that
the vehicles do not touch.
If either battery has vent caps, remove them and check the
fluid level. If it is OK, replace the caps before going further. If
the level is low, add distilled water and replace the caps
Electrical System
before proceeding. If no water is available, remove the caps
and cover the filler openings with a cloth. After jump starting
the vehicle, dispose of the cloth.
WARNING! If you do not cover the filler openings
on the battery, electrolyte could boil out of the
openings and cause death, injury or damage the
vehicle. Replace caps securely if the battery has
the full level of electrolyte. If the electrolyte is
low and no water is available, cover with a cloth.
Preparing the vehicles:
1. Position the two vehicles together, but do not let them to
touch.
2. Turn OFF all lights, heater, radio, and any other accessory.
3. Set the parking brakes: pull out the Yellow button
located on the dash.
4. Shift the transmission into park position. (See Pages 67
and 34 for transmission shifting and parking brake information.)
5. Turn engine OFF (booster vehicle).
6. Disconnect ground cable on booster battery.
Medium Duty (R05/09) Y53-6027 – 223 –