An alternator, as an integral part of every combustion engine vehicle, its main responsibility is to convert chemical energy to electrical energy so that you can charge and replenish the battery in your engine and other electrical components in a car.
If your engine won't turn over or takes far longer than usual, it's time to grab the jumper cables and attempt a jump-start. If your engine starts and stays running but won't start again later, it's likely a battery problem. If your vehicle immediately stalls, it's probably a bad alternator.
An alternator should last between 80,000 to 150,000 miles, which usually means around 7-10 years. However, if your vehicle is driven hard, your alternator may need to be replaced sooner.
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