The Symptoms of a Noisy Alternator


The alternator is the power generation system in your engine. When the alternator is running properly, it charges the battery as long as the car is running. If the alternator does not work or is improperly providing power to the battery, the car will only be able to run for a few minutes on battery power alone. If you have a noisy alternator, you can begin to diagnose the problem yourself by selectively eliminating a series of issues one at a time until you find the problem.

Loose Drive Pulley

  • Check the drive pulley for rattling by holding it with your hand and testing it by shaking it back and forth. There should be very little play. If the pulley is loose, tighten the pulley by using a wrench on the pulley nut in the center.

Loose Mounting Bolts

  • The alternator is held in place by a series of mounting bolts. Occasionally they become loose over time, causing the alternator to rattle. Check the bolts and tighten as necessary.

Worn or Dirty Alternator Bearings

  • If the bearings in your alternator are worn or dirty, the drive-shaft of the alternator will have a hard time spinning freely, causing heat to build up and extra strain on the alternator. If the alternator does not spin freely, the bearing may be worn and the entire unit may need to be repaired or replaced by a professional.

Defective Stator

  • The stator inside the alternator is a series of electro-magnets that creates the AC current to charge the battery. If the stator is bad, it may no longer be providing sufficient power to charge the battery. You will need to test for open circuits and for a proper ground connection in the stator

Related Searches


  • Photo Credit Hemera Technologies/ Images
Promoted By Zergnet


You May Also Like

  • Engine Noise Oil Treatment

    Every engine manufactured will eventually wear out. Piston rings wear down and the engine will begin to burn oil, leading to smoke...

  • A Grinding Noise in the Alternator

    An automotive alternator is responsible for providing the vehicle with electrical power while the engine is running as well as charging the...

  • Ticking in the Alternator

    An alternator is responsible for supplying an automobile with electrical power and charging the battery. A ticking sound is often an indication...

  • Cause of Alternator Pulley Squealing

    A squealing alternator pulley is not only annoying, it indicates a problem with the car's belts or alternator. Left unattended, the problem...

  • How to Fix an Alternator

    Fixing the alternator in your car can be a daunting task. You must disassemble it, repair it and reassemble it after the...

  • How to Stop a Squeaky Alternator

    Squeaky alternators are typically caused by a loose alternator belt, and all that is required to fix the problem is to tighten...

  • My Drive Belt Is Making Screeching Noises

    The alternator drive belt, also known as the fan belt, is an important part of your car's engine. The alternator drive belt...

  • Signs of Car Alternator Problems

    The electrical system is one of an automobile's most important components; critical to the proper operation of various electrical devices and the...

  • Symptoms of Alternator Bearing Problems

    The alternator in a vehicle takes gas and converts it into power that the vehicle can use. According to Mister Fix It,...

Related Searches

Check It Out

How To Travel For Free With Reward Points

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!