The battery's job is to start the car, and the alternator keeps it running.” Gunning says an alternator typically lasts about seven years, or about 100,000 to 150,000 miles, adds Waits. Some mechanics, though, say they typically see alternators last about 80,000 miles.
Accordingly, how much voltage should an alternator put out?
A car alternator needs to be putting out at least 13-14 volts (ideally between 13.8 and 14.2 volts) to effectively charge a 12 volt car battery. If the alternator is putting out too much voltage (15+ volts), it is likely your battery acid will boil over out of the battery.
Can the alternator overheat the car?
The alternator has vent holes that allow heat to escape and help to prevent overheating. Burned Alternator: If the battery does not hold a charge of 12.4 volts or more, the alternator will constantly try to recharge a depleted battery. This constant charging can cause an alternator to overheat.
How long does it take to get a new alternator?
The make and model of your vehicle will determine the exact time it takes to replace the alternator, but usually, one to two hours is sufficient.