Voltage Under Load, Measuring

Voltage Under Load, Measuring

Special tools and equipment







- VAS 5097A battery tester

NOTE: Battery charger operation.

WARNING: Observe accident prevention procedures, wear protective clothing i.e. protective goggles and leather gloves.

Test sequence
- Switch off ignition.
- Connect clips to battery posts as described in operating instructions of tester. The clips must make good contact with battery posts.
- The load current will vary depending on battery capacity and must be set on tester accordingly.
See Battery tester operating instructions
The load test currents can also be taken from the following table.
- Perform battery load test in line with operating instructions and compare test result to table.
The result of the load test is the minimum voltage for battery capacity concerned.
The load current and minimum voltage vary depending on battery capacity.







- Replace battery if minimum voltage is not reached.

Explanatory notes on battery load test:
The battery voltage drops due to the heavy load on the battery during this test (flow of high current).

If the battery is OK, the voltage will only drop to the minimum voltage level.

If the battery is malfunctioning or a weak charged, the battery voltage will drop very quickly to below the minimum voltage level stated.

After completing test these low voltage values remain over an extremely long period, voltage increases very slowly again.