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The primary functions of the alternator are to generate electricity for the vehicle's electrical components and to charge the battery. The alternator generates electrical energy by converting mechanical energy. Without an alternator, the battery would not be able to produce enough power to start the engine.
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Factors Resulting in Alternator Failure to Charge the Battery Alternators and batteries do not last forever, and each has a specific lifespan. A car battery has a life span of 2 to 5 years, depending on how frequently you drive and the environment in which you live. One of the most common causes of car alternator failing to charge a battery is that it has failed. When the engine is turned off, connect a voltmeter to the battery to easily measure the voltage. For more information, speak with your car mechanic the next time your car is scheduled for a car service in Reading.