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BATTERY
JA
DIAGNOSIS AND TESTING (Continued)
(8) If battery passes load test, it is in good condi-
tion and further tests are not necessary. If it fails
load test, it should be replaced.
BATTERY OPEN CIRCUIT VOLTAGE TEST
An open circuit voltage no load test shows the
state of charge of a battery and whether it is ready
for a load test at 50 percent of the battery's cold
crank rating. Refer to Battery Load Test. If a battery
has open circuit voltage reading of 12.4 volts or
greater, and will not pass the load test, replace the
battery because it is defective. To test open circuit
voltage, perform the following operation.
(1) Remove both battery cables, negative cable
first. Connect a Volt/Ammeter/Load tester (Fig. 9) to
the battery posts (Fig. 10).
(2) Allow the battery to stabilize for 2 minutes,
and then verify the open circuit voltage (Fig. 11).
(3) This voltage reading will approximate the state
of charge of the battery. It will not reveal battery
cranking capacity.
Fig. 9 Testing Open Circuit Voltage
Fig. 10 Volt-Ammeter Load Tester Connections
Open Circuit Volts
11.7 volts or less
12.0
12.2
12.4
12.6 or more
Fig. 11 Battery Open Circuit Voltage
SERVICE PROCEDURES
BATTERY CHARGING
A battery is considered fully charged when it will
meet all the following requirements.
• It has an open circuit voltage charge of at least
12.4 volts (Fig. 11).
• It passes the 15 second load test, refer to Bat-
tery Load Test Temperatures Chart above.
WARNING: DO NOT ASSIST BOOST OR CHARGE
A FROZEN BATTERY.
EXPLOSIVE GASES FORM OVER THE BATTERY,
DO
NOT
SMOKE,
SPARKS NEAR BATTERY.
CAUTION: Disconnect the battery NEGATIVE cable
first (Fig. 3) before charging battery to avoid dam-
age to electrical systems. Do not exceed 16.0 volts
while charging battery. Refer to the instructions
supplied with charging equipment
Battery electrolyte will bubble inside of battery
case while being charged properly. If the electrolyte
boils violently, or is discharged from the vent holes
while charging, immediately reduce charging rate or
turn off charger. Evaluate battery condition. Battery
damage may occur if charging is excessive.
Some battery chargers are equipped with polarity
sensing devices to protect the charger or battery from
being damaged if improperly connected. If the bat-
tery state of charge is too low for the polarity sensor
to detect, the sensor must be bypassed for charger to
operate. Refer to operating instructions provided
with battery charger being used.
CAUTION: Do not overcharge Battery refer to
Charging Rate Chart.
After the battery has been charged to 12.4 volts or
greater, perform a load test to determine cranking
capacity. Refer to Battery Load Test in this Group. If
the battery will endure a load test, return the bat-
tery to use. If battery will not endure a load test, it
must be replaced. Properly clean and inspect battery
BATTERY
Percent Charge
0%
25%
50%
75%
100%
USE
FLAME,
OR
8A - 7
CREATE
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