Jump Starting - PREVOST Motorcoach XL Series Operator's Manual

JUMP STARTING

Whenever it becomes necessary to start the
engine while batteries are discharged, use another
power source of the same voltage (24 volt DC),
negative grounded and proper jumper cables.
WARNING:
Procedure other than the one
outlined could cause injury or damage from battery
acid spray, explosion, or charging system overload.
• Never connect to the negative post of the
discharged battery.
• Never allow the two vehicles or the jumper
cable clamps to touch each other.
• Never attempt to jump start a vehicle if the
discharged battery fluid is frozen or if the battery
fluid level is low, as the battery may rupture or
explode.
• Do not jump start vehicles equipped with
maintenance-free batteries if the test indicator is
light yellow.
• Turn off all lights, heaters and other electrical
accessories. Make sure the parking brake is
applied and the
"NEUTRAL" before attempting to jump start the
engine.
• Wear eye protection and remove rings, watches
with metal bands and other metal jewelry.
1. Connect one end of the red jumper cable to the
positive (+) post of the booster power source.
2. Remove the red protective cap from Booster
Block's Positive Stud, then connect the other end
of the red jumper cable to this stud.
3. Connect one end of the black jumper cable to
the negative (-) post of the booster power source.
4. Remove the black protective cap from Booster
Block's Negative Stud, then connect the other end
of the black jumper cable to this stud.
5. Start the engine in the vehicle that is providing
the jump start. Let the engine run for a few
minutes, then start the engine in the vehicle that
has the discharged batteries.
WARNING
: Do not engage starter for more than
15 seconds. Allow starter time to cool before
engaging again. This will prevent starter from
overheating and will allow time delay relay time to
cool.
transmission is set to
STARTING AND STOPPING PROCEDURES
6. To remove the cables, perform the above
procedure in reverse order, then replace the
protective caps on booster block posts.
NOTE:
Jumper cables must withstand 500
cranking amperes. If cable length is 20 feet (6 m)
or less, use 2/0 (AWG) gage wires. If cable length
is between 20-30 feet (6-9 m), use 3/0 (AWG)
gauge wires.
NOTE:
If, after doing this procedure, Starter turns
but Engine still doesn't run; (with Jumper Cables in
place) wait approximately 15 minutes (to give
battery equalizers time to balance 12V and 24V
charges), then try again. If engine still doesn't run,
repeat procedure once again.
On XL-40 vehicles, booster block is located in the
engine compartment and is accessible through
engine R.H. side door.
FIGURE 81
On XL-45 vehicles, booster block is located in main
power compartment (refer to figure 82).
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