DSG-423 CHARGING SYSTEM
06-10
Battery Charging
WARNING: REFER TO CAUTIONS & WARNINGS AT
THE BEGINNING OF THIS SECTION.
NOTE: If excessive gassing or electrolyte spewing
occurs during the charge, discontinue charging. The
battery has reached serviceable charge. If the battery
will not accept at least 5A after 20 minutes of charging,
replace the battery.
WARNING: WEAR SAFETY GLASSES. BATTERY
CHARGING CAN BE DANGEROUS. WHILE BEING
CHARGED, THE BATTERY PRODUCES A
POTENTIALLY EXPLOSIVE MIXTURE OF
HYDROGEN AND OXYGEN GASSES. KEEP
SPARKS, FLAMES AND LIGHTED CIGARETTES
AWAY FROM BATTERIES. IN CASE OF ACID
CONTACT WITH SKIN, EYES OR CLOTHING,
FLUSH IMMEDIATELY WITH LARGE AMOUNTS OF
WATER. GET MEDICAL ATTENTION.
Inspect and service any of the following pre-existing
conditions before recharging a discharged battery --
Refer to“Preliminary Checks” on page 5 of this section.
Cold batteries will not readily accept a charge.
Therefore, batteries should be allowed to warm up to
approximately 5°C (41°F) before charging. This may
require four to eight hours at room temperature
depending on the initial temperature and battery size.
A battery which has been completely discharged may
be slow to accept a charge initially, and in some cases
may not accept charge at the normal charger setting.
When batteries are in this condition, charging can be
started by use of the dead battery switch on chargers so
equipped.
To determine whether a battery is accepting a charge,
follow charger manufacturer’s instructions for use of
dead battery switch. If switch is the spring-loaded type,
it should be held in the ON position for up to three
minutes.
After releasing switch and with charger still on, measure
battery voltage. If it shows 12 volts or higher, the battery
is accepting a charge and is capable of being
recharged. However, it may require up to two hours of
charging with batteries colder than 5°C (41°F) before
charging rate is high enough to show on the charger
ammeter. It has been found that all non-damaged
batteries can be charged by this procedure. If a battery
cannot be charged by this procedure, it should be
replaced.
A rapid recharge procedure has been developed for
recharging batteries that only need a quick recharge.
This can be due to battery in-service no-start battery
failures (engine will not crank due to low battery state of
charge) or battery discharged due to key-off loads.
The battery can be rapidly recharged by using either of
the following methods.
• Perform a two-hour charge using 20A constant
current (manual setting on charger).
• Perform a two-hour charge using a constant
potential (automatic setting on charger).
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