Replacing parts inside the alternator, such as carbon brushes, the diode plate, or the voltage regulator, was more common on older cars. Replacing either of these generally requires you to have more advanced knowledge about alternators. Sometimes there is an electrical problem in the alternator, and even if the voltage does not change, it might be damaged.Īnother common cause is bad diodes or a voltage regulator. Alternatively, you could replace the entire alternator. If the voltage changes and go back to normal when you tap it lightly with a hammer while the car is running, that means the carbon brushes are worn out and need to be replaced in the alternator. You can carefully tap it with a hammer while the car engine is running while checking it with a multimeter on the car battery to see if the voltage is within the charging range. The most common reason why your car is not charging the battery is actually because of a worn-out or damaged alternator. Worn out carbon brushes or damaged alternator Here is a list of the 5 most common reasons why your alternator is not charging the battery. Now that you know the most common reasons in brief, you’ll probably want to read about them in greater detail. Your alternator will also not charge the battery if the serpentine belt has snapped off. It can also be caused by a blown fuse or bad wiring. The most common reason why an alternator is not charging the battery is due to worn carbon brushes or a damaged alternator itself. Conclusion Reasons Why Your Alternator Is Not Charging
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