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b) Testing the charging circuit (alternator test)
All manuals and user guides at all-guides.com
This measurement is to be performed for 12 V systems only. This
measurement tests the charging system of the vehicle. A permanently
undercharged or overcharged car battery can cause bad battery
performance or defects. Perform a load test (as described previously)
before conducting this check. If the battery is in good condition, you can
continue the measurement.
1. Let your vehicle reach normal operating temperature. Then switch off
the engine, all connected appliances and any connected battery charger.
2. Connect the terminal clamps (7) to your car battery. Connect the red
positive clamp to the positive terminal of the car battery first and then
connect the black negative clamp to the negative terminal. Ensure a
secure connection of the terminal clamps.
3. Turn on the engine. Keep your engine running at a slightly high idle
speed of approx. 1500 rpm (revolutions per minute).
Do not press the LOAD button when measuring.
4. Check the battery voltage reading in the digital display and compare it
to the following table. The table is a reference for comparing the voltage
value.
Measuring result
The voltage displayed is
lower than 13.5 V.
The voltage displayed is
between 13.5 and 15 V.
The voltage displayed is
higher than 15 V.
36
Result analysis
The voltage is insufficient. Check the
electric alternator.
The charging circuit (electric alternator) is
in good condition.
The voltage is too high.
Check the electric alternator.
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