No Load Voltage, Checking

No Load Voltage, Checking


CAUTION!
- Battery cell caps must be screwed in tightly when charging, measuring voltage or performing load tests.
- The following notes and procedures must be followed to ensure correct measurements.


Special tools, testers and auxiliary items needed







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

NOTE:
- If no load voltage is to be measured with the battery installed in the vehicle, first disconnect ground strap.
- Vehicle must not be started or driven (with battery to be tested) for at least 2 hours before taking measurements.
- During this time, no load or additional charge is to be applied to battery.


Check battery no load voltage as follows:
- With battery installed and ignition switched off, check voltage between battery terminals with voltmeter.
- No load voltage 12.5 volts or above: battery OK.

Battery no load voltage must not be below 12.5 volts. If below 12.5 volts, recharge battery immediately.


NOTE: After charging battery:
- Wait two hours before taking measurements
- During this time, no load or additional charge is to be applied to battery.


- Again check voltage between battery terminals with voltmeter.

- No load voltage below 12.5 volts: replace battery.