No Load Voltage, Checking

No load voltage measurement

Special tools and equipment

Multimeter Fluke 83 or equivalent

- Switch ignition off.

- Disconnect battery Ground (GND) strap.


After a waiting period of at least 2 hours, during which the battery must not be loaded or charged:

- Measure battery voltage using multimeter.

The battery no load voltage must be lower than 12.5 V.

If the multimeter displays 12.5 V or more the battery voltage is OK.

If the multimeter displays a battery voltage below 12.5 V:

- Charge battery.

After a waiting period of at least 2 hours, during which the battery must not be loaded or charged:

- Measure battery voltage using multimeter.

The battery no load voltage must be lower than 12.5 V.

- If battery no load voltage is not OK, replace battery.