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Why do you need to replace your alternator pulley?

In your automobile, the battery stores electricity to start the engine. When the engine runs, the alternator has to charge the battery. The major element of the charging system is the alternator. If the alternator does not operate, your motor might remain running until the battery power is gone for a short while. The power supplier is linked to the motor and operated by a drive belt. It needs no maintenance and only if it stops or if there is a different problem with it. it needs replacement.

Here we must first refer to some of the symptoms of alternator failure:

Symptoms of alternator failure

Test the result

An alternator dies out in stages and this is where your test lies. By spinning three plates over winding copper wires, an alternator creates power. These plates may fail one by one and decrease the power output, but not halt. As additional plates break, the electricity decreases to the levels where the battery will finally die and the ignition mechanism fails. The frequent voltage measurement of the output with a tester while the automobile runs might indicate that these or other components wear out. Most automobile component stores are free to test alternators and batteries as they may then sell components to the owner. If the tension falls below the limit, the alternator fails.

Examine the Battery

An alternator will frequently fail as a result of being strained by a dead or failing battery. The usual alternator’s duty cycle will charge a battery while the automobile is operating, and accessories such as the air conditioner or lighting system will not allow the alternator to rest. Charging at maximum capacity for days or even weeks may quickly wear down an alternator; the unit is attempting to recharge a battery that is acting as a large load rather than an energy bank, shortening the alternator’s lifespan. At rest, the battery will have a charge of around 12 volts, and during charging, it may reach 14 volts, but not below 12 volts.

Slippage of the Belt

A worn or broken drive belt might cause the alternator’s pulley wheel to slide, resulting in a lower voltage output. This is sometimes accompanied by a loud screeching sound, although it can also be subtle and unnoticed. A sliding belt can cause the alternator to undercharge the system, causing the battery to die and the alternator to be damaged.

Sounds to be heard

A rotor rotates on a pair of ball bearings within the alternator. These bearings might “catch” when they acquire flat areas as they wear. This makes a terrible racket and can turn into a continuous grinding sound. The noise can be so loud that it drowns out the sound of the engine or even the music system in the car. The normal owner’s only option is to replace the alternator. These bearings can be replaced by alternator repairing firms, however, they are not user-serviceable.

Reasons for faulty alternator pulley

The alternator is dead, or there is a problem with the alternator

This one is self-evident. A new alternator should have a lifetime of between 5 and 8 years. If you’ve had electrical problems for so long, your alternator may just be worn out and has to be replaced. If you suspect it’s your battery, keep in mind that batteries typically last between 2 and 5 years. In hotter environments, the battery power may be depleted faster, thus your battery life may be reduced to two years. The alternator, on the other hand, should be unaffected by the temperature.

Problem with the Computer

Computer systems, such as the ECU, are now standard in newer cars. Virtually every component of the car, including the alternator, is managed by these systems. Even if the alternator is in good condition, a malfunction or error with the computer system might prevent it from charging correctly. There’s a good chance that a computer problem will lead to other problems. That’s how you’d know that was the root of the problem.

Wiring Issues

The alternator is powered by a network of cables throughout the car. If one of these wires becomes broken or worn out, the alternator may fail to function properly, resulting in the battery not being charged.If none of the other issues listed above are present in your car, examine the wiring of the alternator, as this might be the cause of the alternator not working.

Broken Pulley or Broken Belt

Alternators create electrical energy for the car using the mechanical power of a belt and pulley. The problem is that the alternator belt and pulleys are not very robust, allowing them to break quickly.

Pulleys generally endure a long period before being damaged due to wear and tear. Belts are flimsier and, given enough time, will begin to crack and even snap. There would be no mechanical energy created for the alternator to convert if one of these situations happened. This is where overrunning alternator pulley which helps to avoid any slippage and vibration in the belt.


This article demonstrates the reasons why your alternator pulley is failing, and the symptoms for it. It is crucial to replace your alternator pulley in order for smooth and uninterrupted functioning. This article acts as a guide for people to know more about the issues with your alternator pulley so that you can get help by identifying the problem.