How To Fix A Malfunctioning Chevy Alternator

A malfunctioning alternator can cause a range of issues in your Chevy, from dimming lights to a dead battery. The alternator is a critical component responsible for charging the battery and powering the electrical systems while the engine is running. Identifying and addressing alternator issues promptly can prevent further damage and keep your vehicle operating smoothly. This guide will help you understand the symptoms, diagnose the problem, and take steps to fix a malfunctioning alternator.

Knowing the warning signs of an alternator issue can help you take action before your vehicle breaks down:

1.    Dimming or Flickering Lights: Headlights, dashboard lights, or interior lights that dim or flicker may indicate an alternator problem.
2.    Battery Warning Light: A battery-shaped warning light on your dashboard may illuminate when the alternator isn’t charging the battery properly.
3.    Weak or Dead Battery: A failing alternator may not charge the battery fully, leading to difficulty starting the vehicle or a completely dead battery.
4.    Electrical Failures: Issues like malfunctioning power windows, radio, or air conditioning can point to a faulty alternator.
5.    Unusual Sounds: Grinding or whining noises under the hood can indicate a problem with the alternator bearings or internal components.

Before replacing the alternator, confirm that it is the source of the problem:

1.    Check the Battery: Use a multimeter to test the battery’s voltage. A fully charged battery should read around 12.6 volts when the engine is off. With the engine running, it should read between 13.8 and 14.8 volts. If the voltage doesn’t increase when the engine is running, the alternator may be malfunctioning.
2.    Inspect the Belt: A loose or damaged serpentine belt can prevent the alternator from functioning correctly. Check for cracks, fraying, or looseness.
3.    Listen for Noises: With the engine running, listen for any unusual sounds coming from the alternator.
4.    Load Test: Turn on electrical systems like the headlights, radio, and air conditioning to see if the alternator can handle the load. Flickering lights or stalling could confirm the issue.

If the alternator is confirmed to be malfunctioning, it’s time to repair or replace it:

1.    Disconnect the Battery: For safety, disconnect the negative battery cable before working on the alternator.
2.    Remove the Alternator:
o    Loosen the serpentine belt using a wrench or ratchet to release tension.
o    Disconnect the electrical connectors and mounting bolts holding the alternator in place.
o    Carefully remove the alternator from its bracket.
3.    Inspect and Replace:
o    Have the alternator tested at a parts store to confirm it’s faulty.
o    If repair is an option, replace worn bearings or internal components. Otherwise, install a new or remanufactured alternator.
4.    Reinstall the Alternator:
o    Secure the alternator with mounting bolts and reconnect the electrical connectors.
o    Reattach the serpentine belt, ensuring proper tension.
5.    Reconnect the Battery: Reconnect the negative battery cable and start the engine to verify the alternator is functioning correctly.

Regular maintenance can extend the life of your alternator:
•    Inspect the serpentine belt periodically and replace it if worn.
•    Keep the battery terminals clean and free of corrosion.
•    Avoid running electrical accessories excessively when the engine is off.

If your Chevy has a malfunctioning alternator, trust the certified technicians at Sarchione Chevy of Garrettsville to provide expert diagnostics and repairs. We use state-of-the-art tools and genuine Chevrolet parts to keep your vehicle running smoothly.

While visiting, explore our wide selection of new and pre-owned Chevrolet vehicles. Whether you need professional servicing or are looking for your next Chevy, Sarchione Chevy of Garrettsville is your go-to destination. Schedule your visit today and let us take care of your vehicle’s needs.