No-Load Voltage, Measuring

No-load Voltage, Measuring

Special tools, testers and auxiliary items

- Multimeter VAG 1526, or VAG 1526A, or Fluke 83, or Volt-Amp tester Sun VAT 40 (or equivalent).

WARNING:
- The battery plugs must be screwed in tightly when charging, measuring voltage or performing load tests.
- Ensure that following notes are observed otherwise correct measurements can not be guaranteed.

NOTE:
- If the no-load voltage measurement is carried out with the battery installed in the vehicle, the Ground strap MUST be disconnected.
- The battery must not be subjected to electrical load from connected equipment for at least 2 hours before taking the measurements.
- The battery must not be charged for at least 2 hours before taking the measurements.

Check the battery voltage in a no load condition as follows:

- Switch off ignition.
- Disconnect Ground strap at battery.
- Test voltage between battery terminals.

- If the tester reads 12.5 Volt or above, then the battery is OK
- The battery no-load voltage must at no time drop below 12.5 V (Volt). If this is the case then recharge the battery immediately

- Test voltage between battery terminals again.
- The battery no-load voltage must not be less than 12.5 V
- If the battery no-load voltage is not as specified, install a new battery.