Tips Sahabat

5 Causes of Alternator Not Charging That Drivers Need to Know!

09 April 2025
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Not a few car owners neglect the maintenance of various components. In fact, this can cause damage, especially to the alternator. Therefore, here are some causes of the alternator not charging.

1. Alternator Belt Twisted 

The first indication that the starter motor or alternator is experiencing damage is the sound of squeaking. Usually, this squeaking sound comes from the engine compartment under the hood of the car. 

If the squeaking sound becomes clearer, there is a possibility that the pulley is misaligned. Not only that, this condition is also caused by a twisted alternator belt.

This condition of the alternator belt causes the squeaking sound. However, sometimes this occurs due to a damaged or broken diode rectifier. 

If this happens to your vehicle, check the condition of the alternator in the engine. If you are still a novice, the best step is to take it to the nearest workshop.

2. Problematic Alternator and Battery Cable Connections

The next cause of the car alternator not charging is a problem with the connection between the starter motor and the battery. This occurs if the beloved vehicle is indeed aging. 

You should know that connections play a very important role in delivering electrical power from the alternator to the battery or vice versa.

If there is a problem caused by a loose connection or corrosion interfering, try to address it as soon as possible by taking it to an official service center. 

Because if not addressed promptly, the result will be that your beloved vehicle will not be able to start or turn on. Surely you don't want this to happen, right?

3. Diode Rectifier Broken

When the alternator is operating, there are several supporting components to facilitate the flow of electricity produced. For example, the diode rectifier which serves to disconnect or connect the voltage of the IC regulator. 

If the diode rectifier is broken, then the electrical current cannot be transmitted. In fact, this will be the cause of the alternator not charging.

Read also: 4 Causes of Automatic Car Engine Not Starting

4. Loose Alternator Belt

Before the squeaking sound appears, usually what happens and causes the alternator not to charge is due to a loose or not tight belt. 

This occurs due to frequent use and lack of regular maintenance. Sometimes this problem often occurs in older four-wheeled vehicles.

A loose alternator belt can cause the alternator to not function properly. If left unchecked, the engine will emit a very disturbing squeaking sound. 

The most effective way is to conduct regular inspections and maintenance on each component.

5. Output Energy Too High

As is known, the alternator is a component that delivers electrical current to all engines. 

If the electrical current received is then transmitted in large amounts, this will become a cause of the alternator not charging. Sometimes this occurs due to an output that is too large and not up to standard.

Keeping the vehicle in prime condition is something that every owner always dreams of. However, over time, some components will experience damage. This is certainly unavoidable. 

Therefore, you must always pay attention to the condition of your beloved car by performing proper maintenance.

Read also: Pay Attention to the Following Car Maintenance Tips

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