A faulty alternator can leave you stranded in rush hour traffic and damage your battery. If the alternator stops charging — or charges intermittently — the voltage the battery supplies the vehicle drops, and other systems may stop working or be adversely affected. If you've noticed your vehicle running low on juice, it's time to test the alternator and see if it's giving the battery what it needs.
Follow these simple steps to test your alternator while the car is running without any special equipment.


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