Napa Essentials 85-640 manual Tester Status LEDs, Initial Percent Calculation

15.7TESTER STATUS LEDs

When the charger is operating as a battery tester, the status LEDs light under the following conditions:

•The CHARGED LED will light if a charged battery is tested.

•The CHARGING LED does not light in the battery test mode.

•The connected LED lights if a properly connected battery is detected.

•When the tester digital display is set to voltage, the CHARGED and CHARGING LEDs won't light (it could be testing a battery or an alternator).

15.8INITIAL PERCENT CALCULATION

When a battery % is calculated for the first time after connecting a battery, the digital display will show three dashes (“---”) for a period as long as several seconds while the tester analyzes the battery.

15.9NOTES FOR TESTING BATTERY %

A recently charged battery could have a temporarily high voltage due to what is known as “surface charge”. The voltage of such a battery will gradually drop during the period immediately after the charging system is disengaged. Consequently, the tester could display inconsistent values for such a battery. For a more accurate reading, the surface charge should be removed by temporarily creating a load on the battery, such as by turning on lights or other accessories.

The battery % ranges from 0 to 100.

The battery tester is only designed to test batteries. Testing a device with a rapidly changing voltage could yield unexpected or inaccurate results.

16.Using the built-in alternator tester

This battery charger has a built-in alternator tester that displays either an accurate alternator voltage or an estimate of the alternator’s relative output compared to normal alternators. The Alternator % values displayed should be taken as general reference, not precise diagnosis. The alternator tester functions the same as the battery tester (see previous section of this manual for details) with a few differences.

16.1TESTING SEQUENCE

There are three basic steps required to use the unit as an alternator tester.

1.Connect the charger battery clamps to the battery or charging system. Be sure to follow all safety precautions listed.

2.Connect the charger power cord to a 120V AC wall outlet. Again, be sure to follow all safety precautions listed.

3.Start the vehicle and turn on the vehicle’s headlights. Read the voltage on the digital display or press the digital display button to set the tester to Alternator % and read the alternator percent.

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