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A charging system test is done to check the internal voltage regulator. It can be done at any auto parts place.
with a regulator tester kohler sale one that will test most regulators
How_do_you_check_your_voltage_regurlator_on_your_motorcycle
with a kohler regulator tester
You need the test equipment and a bunch of knowhow.
With engine running, ensure system voltage is in the 13-14 volt range.
it is inside the alternater, not stand alone.
Usually the voltage supplied to your battery when the engine is running is about 13.5-14 volts max. If the output is higher or lower than 12 volts, then the regulator could be faulty. hope this helps
You will need to go to a repair shop and have them test the charging system.
have the battery checked and test the voltage regulator
The red battery symbol indicates that there is a problem with the charging system. It could be the alternator (faulty), voltage regulator (old), bad battery (old). or a blown fuse. If possible, after checking the fuses, you may have to recharge the battery overnight and then drive the vehicle to an automotive store (a close one) that can test the suspected equipment. I say this because it is near impossible to remove the alternator on a 2001 beetle (I had the same problem) and could not remove it myself to take in for testing, due to the tight space of its location and the other systems that were blocking access to the 2 bolts. If the alternator tests good, look at replacing the voltage regulator. The alternator can still be putting out the correct amount of charge and be good, but if the regulator goes out it may not show on the test. The voltage regulator is a small voltage sensor with brushes in it...should be around $75
Test/replace the voltage regulator. The year, make and model info would help.