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CAT: 8612 November 2019
PREVENTIVE MAINTENANCE
BATTERIES
Battery Care
Regular attention to the charging system will help prolong the service life
of batteries. Following are some of the common causes for battery failure.
Isolation Switch
Essential for vehicles carrying dangerous loads i.e. petroleum products,
gases, acids, explosives etc. The switch is designed to shut off all battery
power, this will disable the Remote Keyless Entry and radio pre-sets in
order to maintain total emergency electrical isolation.
Field Isolated Alternator
A field isolated alternator is fitted to the vehicle when battery isolation
switch is installed. Field isolated alternator must be used when replacing
alternator in service.
Batteries
If a hydrometer check indicates that a battery is less than 80% charged,
the battery should be recharged to full capacity (See table on page 256
Hydrometer Readings).
Overcharge
Improper voltage regulator setting results in overheating, warped plates
and ‘boiling off’ of electrolyte.
Undercharge
A faulty or improperly set voltage regulator, slipping drive belt, long periods
of standing idle or short-distance driving may result in battery plates
becoming ‘sulphated’ with a hard coating.
Vibration
Loose battery hold-downs can result in battery plate failure.
Dirty or Loose Connections
These can stop the flow of electrical power to and from the battery.
Short Circuits
These will discharge the battery through electrical ‘leaks’.
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