JLG sky trak mmv Service Manual page 577

e. Battery Troubleshooting
If a battery has tested satisfactorily but then fails to per-
form satisfactorily for no apparent reason, the following
items are among the more popular factors that may help
understand the cause:
1. Vehicle accessories left on, causing battery
discharge.
2. Charging system defect, such as slipping fan belt,
high wiring resistance, or faulty alternator.
3. A vehicle electrical load exceeds alternator output
capacity (common with the addition of electrical
accessories such as radio equipment, lights, air
conditioning, or window defogging/de-misting
devices).
4. Electrical system defects, such as shorted wires.
5. Extended slow speed driving with many accessories
on, and excessive engine idling (both cases DO
NOT allow engine rpm to reach a sufficient speed to
enable alternator output to sufficiently charge the
battery).
6. Loose or poor battery cable-to-post connections,
previous improper charging of a run-down battery, or
loose battery hold-down hardware.
7. High resistance connections or defects in the
starting system.
8. Failure to disconnect the battery before long periods
of vehicle storage. Small current drains of vehicle
accessories that are connected all the time can also
discharge the battery in a six- to eight-week period.
A battery left in a discharged condition for a
prolonged period of time is subject to freezing and
can become difficult to recharge.
f. Slave Starting with a Booster Vehicle
Note: Use this information in addition to that found in
Section 2.13.17, c. Slave Starting.
Follow the following procedure exactly, and DO NOT
cause sparks to occur:
1. Engage the park lock of the booster vehicle and
place its transmission in NEUTRAL [N]. DO NOT
allow both vehicles to touch each other in any
manner, as this could establish a ground connection
and counteract the jump-starting process.
Model MMV Rev. 12/04
WARNING:
than that outlined in these instructions could
result in:
• Personal injury caused by electrolyte
spewing out of the top vent holes on
the battery.
• Personal injury or property damage
due to battery explosion;
• Damage to the starting systems of both
vehicles.
2. Continue with the jump starting instructions found in
Section 2.13.17, c. Slave Starting .
g. Battery Removal
1. Remove engine side battery box cover (1). Remove
wing nuts (2) and carriage bolts (3) and set cover
and mounting hardware aside for later re-assembly.
2. Disconnect the negative (-) battery cable (4) at the
battery negative (-) terminal on the battery in the
engine side battery box.
3. Disconnect the negative (-) cable (5) at the bottom of
the battery equalizer (6).
2
1
3
Electrical System
Any other procedure
6
5
4
7
MM4220
10.97