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advanced auto parts stores can check it for you

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Q: How do you know if your alternator is bad on an 85 Pontiac fierro?
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How do you know you have a bad alternator?

Turn car on remove positive battery terminal if car turns off alternator is bad


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How do you replace alternator located on a 1999 Pontiac grand am se?

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How do you know when alternator is bad?

Typically you know your alternator is out when you have to jump start your car numerous times. A way you can test it is by turning on your car and while it's running discount the + terminal. If the car turns off then your alternator is bad. If the car remains in then alternator is good and possible bad battery. Hope this helps


How do you know if your alternator is bad?

If it is makeing a noise or is not putting out at least 13.5 volts it is bad. Take the car or the alternator to an Auto Parts store and have them load test the alternator to be sure.