Question about 1994 Jeep Cherokee

2 Answers

Low battery gauge indicated

Battery gauge is low after jeep start....
after driving/revving up engine past 3500 rpm...battery gauge goes back to a "normal indicator"
is this the alternator not working properly....

Posted by on

  • pchan1 May 30, 2009

    the gauge drops as i drive longer....but not into the red yet...if i use the heater or air con...the battery gauge noticably drops also...
    revving up at this point no longer brings the gauge back up to "normal"

    i did clean the terminals but did not notice any difference..

    i don't have a meter but will get one and test voltage readings at cold and at idle...

    thanks guys!


  • pchan1 Jun 02, 2009

    my battery level went into the red while driving to the shop...
    when i noticed it get to the red i was able to turn around b4 getting on the highyway and make it back home.

    i did get some readings...cold at 11.9volts and running at 9.99 volts.

    so i guess it is the alternator...is it still safe to drive in the red at 9.99 volts...will this drop as i drive longer?

    it is an Interstate MT58 battery...i don't know what type of battery it is.....can i recharge at home to bring it back up to 12.8 to 13?




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Not necessarily,this can also be caused by poor battery cable connections or a bad battery cable or a bad connection to the gauge or just a bad gauge.Check or have them checked first,and then have the alternator output tested,a voltmeter connected at the battery posts should measure 14.5 to 14.8 volts at an idle,any lower than this than the alternator is the problem.

Posted on May 30, 2009

  • George DeMore
    George DeMore May 30, 2009

    Here's a couple more voltages to test,the battery should measure around 12.8 to 13 volts with the motor not running,with accelaeration to around 2500 3000 rpms you should measure15.5 to maybe as high as 16V,but by your description be ready to replace the alternator.

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Could be a bad battery, dirty battery connections. From what you state , the alternator seems ok.
To check it, however, you will need to remove it and take to your local auto parts store, as they can check it out for you.

My first route would be the battery connections and then the battery.
Hope this helps!!

Posted on May 30, 2009

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