Once your vehicle’s battery does the job of getting everything started, the alternator takes over to keep it all charged and running. It is also responsible for recharging the battery as you’re driving. A belt attaches the alternator to the engine.
An alternator can last up to twelve years without servicing, but once it goes, you will experience difficulty with keeping your car running. Your car’s warning light should come on at that point with either a battery or alternator symbol.