Symptoms of a Failing Alternator:

1. Dim or Flickering Lights: One of the first signs of an alternator problem is dim or flickering headlights, dashboard lights, or interior lights. This happens because the alternator is not supplying enough power.

2. Electrical Issues: The alternator powers most of your vehicle's electrical systems, so if it's failing, you may experience issues like malfunctioning power windows, air conditioning, radio, or other electronics.

3. Battery Warning Light: A battery-shaped warning light on the dashboard could indicate that the alternator is not charging the battery properly.

4. Dead Battery: If the alternator is not charging the battery, the battery will eventually die. You might experience difficulty starting the car or a complete failure to start.

5. Strange Noises: A failing alternator can make grinding, whining, or whining noises, particularly if the alternator bearings are worn out.

6. Stalling or Difficulty Starting: A dying alternator may cause the car to stall, as it may not be providing sufficient power to keep the engine running smoothly.

7. Overheating: If the alternator is malfunctioning, it may cause the engine to overheat, especially if it affects the cooling system's function.

Average Lifespan of an Alternator:

The average lifespan of an alternator is typically between 80,000 to 150,000 miles (approximately 130,000 to 240,000 kilometers). However, this can vary depending on factors like the make and model of your vehicle, driving conditions, and maintenance. Regularly checking the charging system and battery can help extend the alternator's life.