Which of the following is not a sign of a failing alternator?

A failing alternator typically shows specific signs that relate directly to its function of charging the battery and supplying power to the electrical components of a vehicle. Dim headlights, illuminated battery warning lights, and strange noises when starting the engine are all indicators of potential alternator problems.

Dim headlights occur when the alternator isn't generating enough electricity to power the vehicle's lighting system effectively. This is because the alternator is responsible for maintaining battery charge and providing sufficient power when the engine is running.

The battery warning light illuminating on the dashboard is another direct signal that the alternator is not functioning properly. This light often indicates that the alternator is not charging the battery as it should, leading to a range of electrical issues within the vehicle.

Strange noises when starting the engine can be associated with a failing alternator, particularly if the noise comes from the belt or bearings that are part of the alternator's operation. This can indicate wear or failure in the components that could affect performance.

In contrast, engine overheating is generally caused by issues within the cooling system or engine components rather than a failing alternator. While electrical issues can indirectly lead to overheating by affecting the cooling fan or other systems relying on electrical power, it is not a direct symptom of alternator failure