What are common signs of a failing alternator?

When evaluating the signs of a failing alternator, dimming lights and electrical malfunctions are indeed common indicators. The alternator is responsible for charging the vehicle's battery while the engine is running, and it also powers the electrical systems of the vehicle. If the alternator is failing, it may not produce enough power to maintain the electrical systems, leading to symptoms such as dimming headlights, dashboard lights flickering, or other electrical components malfunctioning.

This situation arises because as the alternator's performance declines, it can no longer adequately supply electricity to the vehicle's systems, which can result in side effects like weak or flickering lights and devices that might not function properly or intermittently. In severe cases, the battery may also become discharged, causing the vehicle to stall or fail to start.

The other options capture symptoms that are typically associated with different mechanical or electrical issues unrelated directly to the alternator's functionality. Thus, focusing on the signs of a failing alternator, the combination of dimming lights and electrical malfunctions serves as a clear and primary indication that further investigation or repair may be necessary.