What indicates that a vehicle's alternator is overcharging?

The indicators of an overcharging alternator primarily revolve around symptoms that significantly affect the vehicle's electrical system and components. An illuminated battery warning light serves as a crucial alert that something is amiss with the charging system. This light typically activates when the alternator is producing excessive voltage, posing a risk to the battery and related electrical parts.

A burning smell often indicates overheating or damage to electrical components due to this excess voltage. If the battery or other electrical parts become too hot, it can lead to reduced performance or even total failure. Additionally, an overheated battery may bulge, leak, or, in severe cases, explode if subjected to prolonged overcharging. These signs collectively highlight vital issues that need immediate attention to prevent further damage to the vehicle's electrical system and avoid safety hazards.

The other options do not directly relate to overcharging. Noises when starting can indicate mechanical issues unrelated to the alternator's function. Flickering headlights might suggest other electrical problems, such as poor connections or a failing alternator, not specifically that it's overcharging. Lastly, difficulties starting in cold weather are typically linked to battery performance rather than overcharging. Thus, the symptoms listed in the correct choice provide a clear, direct correlation to an overcharging alternator