A failing starter will typically exhibit symptoms such as difficulty starting the engine, dim or flickering headlights, and a grinding or clicking noise when attempting to start the vehicle.

The replacement interval for an alternator varies depending on driving conditions and vehicle usage. However, most manufacturers recommend replacing the alternator every 80,000 to 150,000 kilometers.

The starter is responsible for initiating the engine's rotation, while the alternator generates and maintains electrical power for the vehicle's electrical systems, including charging the battery.

Replacing a starter or alternator can be a complex task that requires specialized knowledge and tools. It is generally recommended to have these components replaced by a qualified mechanic.