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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.

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14y ago

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Related Questions

How do you know you have a bad alternator?

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


How do you know when the alternator is going bad?

When your battery does not get charge.


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 2004 dodge ram 1500 alternator is bad?

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I have a 2003 Chevy impala how do i know if i have a bad battery or bad alternator?

To test the alternator if funds are low, let the motor idle and remove the negative battery cable, if the motor dies its probably the alternator.


What causes your alternator not to charge?

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


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Check voltage with a voltmeter at the battery With engine running readings should be 13.8-14.2 With engine running hold a screw driver to the back of the alternator, if there is no magnetic field, the alternator is bad.


How do know when alternator is bad?

If your talking about cars... If you smell a burning smell, or your red battery light comes on then i would get your alternator checked out!


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