Question about 1991 Dodge Dakota

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1991 Dodge Dakota 3.9L new altenator but won't stay charged

Replaced altenator but the battery (brand new from Napa 2 days ago) won't stay charged. It can drive for a ways but it starts to lose charge and die and sputters and chokes up as it dies. Need help asap daughter needs her car

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  • stephbelieve Feb 11, 2009

    NO hadn't check the fuse are you sure there is one on a 1991 Dodge Dakota truck. Sucks that the battery might be bad.

  • stephbelieve Feb 11, 2009

    Thanks still in the testing phase and it is 8:15pm so we will probably have to do the going to Napa tomorrow thank you

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91 dakota v-8's have the voltage regulator in the computer-when all else fails you can either replace computer {must be from 91 if used},there are people that will repair yours. another solution is that some mechanics know how to install an external voltage regulator{by passing computer circuit. all above from personal experience and plenty of hassel. In reguards to rebuilt alternators, they can definately malfunction right out of the box and the same goes for a few new batteries. It's unfortunate but, these days quality control sucks.

Posted on Oct 09, 2013

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Using a multimeter, set it to DC 20V. With the car running you should have 13 or more volts at the battery terminals. If you don't then you have a faulty alternator. If you do, with the car off check the voltage at the battery terminals, you should have over 12 volts. If you don't then you have a faulty battery. If you do have 12 volts, then you need to have the battery load tested. Auto Zone will do this free of charge for you and even change the battery for free if you purchase one from them. I am a mechanic and can tell you firsthand that many new parts from aftermarket retailers are bad right out of the box. Even higher end retailers like Napa.
Please let me know if this helps.

Posted on Feb 11, 2009

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Double check all connections are clean & tight. You need to get a voltmeter and have the voltage tested at battery with engine off & running. Drive it to the Napa shop you bought the alternator from if necessary, they should perform test free of charge, as the possibility of a faulty one is not out of the question, provided all is connected properly. Did you check that a main fuse for alternator wasn't blown in Uunderhood power distribution box?

Posted on Feb 11, 2009

  • Mike Butler
    Mike Butler Feb 12, 2009

    According to some info, I found, you may not have main fuse in the panel for the alternator, but there should be a fusible link in circuit from alternator to + of battery. If alternator happens to check out as charging, then this would be a good place to look for problem.

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