How to Replace a Bad Alternator

Without a properly running alternator in your vehicle, you may find that your vehicle’s battery often goes dead and you need to replace it frequently. By replacing your bad alternator, you can keep your battery running properly and avoid further damage to your car.

What You Will Need

• Replacement alternator


• Socket wrench set


• Replacement serpentine belt


• Breaker and socket

1. Open the vehicle’s hood.


2. Disconnect the cables connected to the battery.


3. Remove the serpentine belt from the alternator. To remove the belt, you may need a breaker and socket to push the tensioner towards the ground. Take note on how the belt is placed before removing.


4. Disconnect any wiring and cables that are plugged into the alternator.


5. Remove the mounting bolts from the alternator.


6. Remove the bad alternator from the vehicle.


7. Place the new alternator into position.


8. Replace the mounting bolts into the new alternator to secure into place.


9. Re-connect the wiring and plugs into the replacement alternator.


10. Run the new serpentine belt the same way it was placed before removal. You may need to move the tensioner to get the serpentine belt into place.


11. Reconnect the battery terminal cables.


12. Close the hood of the vehicle.

Additional Information

• If you forget the way the belt goes around the pulleys, your vehicle should have a diagram under the hood on the front of the car that shows the correct placement.


• To avoid losing the mounting bolts make sure to set aside in a safe place such as in a cup or can.