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How to do an alternator charge test, or how to test whether the alternator is charging the battery properly, here is another video I have added for you for a practical method. The purpose here is to provide a practical method for you to test whether the problem is caused by the alternator in cases of frequent battery discharges or electrical insufficiencies. All you need is an electrical measuring device. The values that the battery voltage should be when the ignition is off while the engine is not running; The value that should be when all the equipment is off while the vehicle is running: between 14v - 14.5v. While the vehicle is running, the value that will cause problems and will not charge the battery properly or may charge it less: 12.5v - 13.5v While the vehicle is running, the value that should be between 13v-14v (Seat heating, tape recorder, heater, resistance, headlight, fog all on) While the vehicle is running, the value that will cause problems and will not charge the battery properly or may charge it less: 12.0v - 13.0v While the ignition is off, cranking limit: 11.50v (below which there is a high probability of not cranking) Battery charge rate when the ignition is off: 12.80v 100% full - 11.00v Fully empty. Values in between are determined as % according to these two ranges...