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8A - 2
BATTERY
DESCRIPTION AND OPERATION (Continued)
will adversely affect battery charging and will result
in battery discharge or damage.
BATTERY IGNITION OFF DRAW (IOD)
A completely normal vehicle will have a small
amount of current drain on the battery with the key
out of the ignition. It can range from 15 to 30 milli-
amperes after all the modules time out. If a vehicle
will not be operated for approximately a 20 days, the
IOD fuse should be disconnected to eliminate the
vehicle electrical drain on the battery. The IOD fuse
is located in the Junction Block number 5. Removing
this fuse will help prevent the battery from discharg-
ing during storage.
CHARGING TIME REQUIRED
WARNING:
NEVER EXCEED 20 AMPS WHEN
CHARGING A COLD -1°C (30°F) BATTERY. PER-
SONAL INJURY MAY RESULT.
The time required to charge a battery will vary
depending upon the following factors.
SIZE OF BATTERY
A completely discharged large heavy-duty battery
may require more recharging time than a completely
discharged small capacity battery, refer to (Fig. 1) for
charging times.
CHARGING
AMPERAGE
OPEN CIRCUIT
VOLTAGE
12.34 TO 12.52
12.16 TO 12.33
11.97 TO 12.15
10.00 TO 11.96
10.00 TO 0
Fig. 1 Battery Charging Time
TEMPERATURE
A longer time will be needed to charge a battery at
-18°C (0°F) than at 27°C (80°F). When a fast charger
is connected to a cold battery, current accepted by
battery will be very low at first. In time, the battery
will accept a higher rate as battery temperature
warms.
5
10
15
AMPS
AMPS
AMPS
HOUR CHARGING AT 21°C
(77°F)
4.6
2.3
1.5
HRS.
HRS.
HRS.
6.9
3.4
2.3
HRS.
HRS.
HRS.
9.2
4.6
3.0
HRS.
HRS.
HRS.
11.5
5.8
3.8
HRS.
HRS.
HRS.
SEE CHARGING
COMPLETELY DISCHARGE
BATTERY
BATTERY BLANKET HEATER
CHARGER CAPACITY
A charger which can supply only five amperes will
require a much longer period of charging than a
charger that can supply 20 amperes or more.
STATE OF CHARGE
A completely discharged battery requires more
charging time than a partially charged battery. Elec-
trolyte is nearly pure water in a completely dis-
charged battery. At first, the charging current
amperage will be low. As water is converted back to
sulfuric acid inside the battery, the current amp rate
will rise. Also, the specific gravity of the electrolyte
will rise. Refer to Battery Charging procedures.
DIAGNOSIS AND TESTING
BATTERY BLANKET HEATER INSPECTION
(1) Remove battery. Refer to battery removal.
(2) Remove blanket heater from battery (Fig. 2).
20
AMPS
1.1
HRS.
1.8
HRS.
2.3
HRS.
2.9
WARNING: SERIOUS PERSONAL INJURY AND/OR
HRS.
ELECTRICAL BURNS COULD RESULT IF THESE
PROCEDURES ARE NOT FOLLOWED.
(3) Clean battery blanket heater vinyl cover with a
baking soda solution and wipe dry.
(4) Inspect blanket heater for cuts, abrasion or
other damage. If heater is damaged replace. If OK,
go to Step 5.
(5) Lay heater flat and connect heater to vehicle's
connector.
(6) Connect the power cord to a 110 volt AC source
for 3 minutes MAXIMUM.
(7) Disconnect voltage source from the power cord.
BATTERY
Fig. 2 Battery Blanket Heater
JA
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