Special Tools
EL 50313 Battery Tester
For equivalent regional tools, refer to Special Tools.
Note:
Using voltage to determine the batteries state of charge is only accurate after the battery has been at rest for 24 hours. This is enough time for the acid in each cell to equalize. If the battery has been charged or discharged in the past 24 hours, the battery state of charge will only be an estimate.
The maintenance-free batteries state of charge is estimated by reading the voltage of the battery across the battery terminals. Because the voltage is affected by current flow into or out of the battery, the engine must be stopped and all electrical loads turned OFF, including parasitic loads, when checking the voltage. The voltage can also be affected if the battery has just been charged or discharged, so it is important to consider what has happened to the battery in the time just before testing. Use the following procedure to determine the battery's state of charge:
Note:
The table is accurate to 10 % only after the battery has been at rest for 12 hours.
Battery Voltage |
% Charge at 0°C (32°F) |
% Charge at 25°C (75°F) |
---|---|---|
12.75 V |
100% |
100% |
12.7 V |
100% |
90% |
12.6 V |
90% |
75% |
12.45 V |
75% |
65% |
12.2 V |
65% |
45% |
12.0 V |
40% |
20% |
Use the state of charge information as follows:
The time required to charge a battery will vary depending upon the following factors:
Caution:
Turn OFF the ignition when connecting or disconnecting the battery cables, the battery charger or the jumper cables. Failure to do so may damage the ECM/PCM or other electronic components.
Caution:
Refer to Fastener Caution.
When charging side-terminal batteries with the battery cables connected, connect the charger to the positive cable bolt and to a ground located away from the battery. When charging side-terminal batteries with the battery cables disconnected, install the battery side terminal adapters and connect the charger to the adapters.
Tighten
Tighten the battery side terminal adapters to 15 Y (11 lb ft).
Use the following procedure to charge the battery:
Caution:
Do not connect the negative charger lead to the housings of other vehicle electrical accessories or equipment. The action of the battery charger may damage such equipment.
If the Vehicle Is Stuck
Slowly and cautiously spin the wheels to free the vehicle when stuck in sand,
mud, ice, or snow.
If stuck too severely for the traction system to free the vehicle, turn the traction
system off and use the rocking method. See Traction Control/Electronic Stability
Control.
Warning
If the vehi ...
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