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Peterbilt 387 - Page 177

Peterbilt 387
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PART 8: MAINTENANCE AND SERVICE ELECTRICAL
(R10/06) Y53-6007 – 179
CAUTION: Departures from these procedures
could also cause serious damage to both
vehicles. Improper use of a booster battery to
start a vehicle may cause an explosion.
To Jump Start Your Vehicle:
1. Wear eye protection and remove rings, metal watch
bands, and any other metal jewelry.
2. Set the parking brakes. Place the transmissions of
both vehicles in Neutral. Do not let the vehicles touch
one another. Turn the ignition key to Off in the vehicle
with the discharged battery. Also turn off lights,
heater, and any other unnecessary electrical load.
3. 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 before proceeding. If no
water is available, remove the caps and cover the filler
openings with a cloth before proceeding. After jump
starting the vehicle, dispose of the cloth.
WARNING! If you do not cover the filler open-
ings on the battery, electrolyte could boil out
of the openings and hurt someone or damage
the vehicle. Replace caps securely if there is
enough fluid in the battery, or cover with a
cloth if no water is available and your fluid is
low.
4. Attach one end of a jumper cable to the dead battery’s
positive terminal. This will have a large red “+” or “P”
on the battery case, post, or clamp. Attach the other
end of the same cable to the positive terminal of the
good battery.
5. Attach the remaining jumper cable FIRST to the neg-
ative battery terminal (black “-” or “N”) of the good bat-
tery, and then to the chassis or ground of the vehicle
being jump started.
6. Start the engine in the vehicle with the good battery.
Let it run a few minutes. Then start the engine in the
vehicle with the dead battery.
If the engine fails to start,
do not continue to crank the starter but contact the near
-
est Authorized Service Center.

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