AUTOOL BST-100 Battery System Tester User Manual
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Charging system shows the generator output normal, no problem
detected.
2) Charging Volt: Low
Charging volt of the charging system is low.
Check drive belt of the generator whether slip or running off. Check
the connection between generator and battery is normal or not.
If both of the drive belt and the connection are in good condition,
follow the manufacturer's suggestion to eliminate generator fault.
3) Charging Volt: High
Generator output volt is high.
Since most of the vehicle generators are using internal regulator, the
generator assembly has to be replaced.(Some old style cars are
using external regulator, then directly replace the regulator.)
The normal high volt of the voltage regulator is maximum
14.7±0.5V.If charging volt is too high, it will overcharge the battery.
Therefore the battery life will be shortened and troubles will be
caused.
4) No Volt Output:
No generator volt output is detected. Check the generator
connection cable and the belt whether they are normal.
5) Diode Test:
Through the test of charging current ripple, tester will find out
whether the diode is normal or not. When ripple volt is too high, it
proves at least one diode is damaged. Check and replace the diode.
Till now, all tests have been done.