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Sometimes the bearings go out sometimes they short out and sometimes they overheat and fry. The only thing you can control is overheating, usually caused by overloading from high power stereos

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Q: Why does an alternator go bad?
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Will an alternator cause a distributor to go bad?

No, it will not.


When does the alternator go bad?

You cannot predict when an alternator will go bad. It may last 150,000 miles and it may only last 50,000 miles. It may go bad due to a bad bearing or internal short.


Can the bad alternator cause the water pump to good bad?

The alternator is belt driven and so is the water pump but that is where the correlation ends. There is no way a bad alternator could cause a water pump to go bad unless the alternator pulley was warped. Then there is a small chance.


Does an alternator make noises when it is going bad?

If bearings go bad they will "squeal"


Could bad wiring cause a alternator to go bad?

Yes it could.


Would a bad alternator cause your air conditioner to blow warm air?

A bad alternator will cause a battery to go bad. It does not have an effect on the air conditioner.


What would go bad if you wired an alternator reverse polarity?

You would probably toast the diodes in the alternator.


What causes your alternator not to charge?

A bad belt, a bad regulator in the alternator or bad brushes in the alternator.


What is the noise that a bad alternator will make?

If bearings go bad on a alternator/ will make a grindind noise or long squilling noise.. but if only electronic's inside alternator are damage no noise wil be heard


Can a crankshaft sensor on a 96 SL1 go bad after the alternator has been replaced?

You more than likely have a bad connection or damaged the CPS when removing the alternator


Why is your alternator overcharging after you replaced it and it ran fine for a week?

It is probably a bad voltage regulator. Sometimes they are located in the alternator and can go bad in a new one. On Ford vehicle the voltage regulator is separate from the alternator.


What makes an alternator go bad?

Internal parts can wear out or burn out.