Question about 1993 Nissan Maxima

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Battery and alternator

I just replace my battery because i am pretty sure that my alternator had a faulty connection to my battery so it was not getting power from the alternator. So i replaced the battery, cleaned out all the connection from the battery cables to the alternator thinking that maybe because it was so gunked up that metal was not touching metal therefor no power. Seemed to work, we checked the charges all had 12v. But the last few times i turned the car on my battery light was coming on....what could be the problem???

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If your alt is putting out 12V you have a faulty alternator. A healthy alternator puts out 14v not 12v. The battery light doesn't indicate a bad battery, rather it indicates voltage is below 14v or 13v, depending on the vehicle.

With the vehicle running use a voltmeter at the alt and test for output voltage, if it's any where close to 12v you have a faulty alt and will need to be replaced.

You could also have a corroded/faulty/loose battery cable/s going from the alt to the starter/battery/alt.

Posted on Oct 17, 2008

  • Daniel Jenkins
    Daniel Jenkins Oct 17, 2008

    It is also possible that the battery you just installed is faulty, it does happen from time to time. New batteries can come brand new with dead cells.

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