Question about 2000 Jeep Grand Cherokee

4 Answers

When I go to start my Jeep the battery dies and it wont turn over. If i jump it...it will start but as soon as I turn it off it dies again. When I put my key to start it...it usually dies instantly and the gages start to jump around.

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  • casie_77 Sep 13, 2010

    I had the battery tested and alternator noth about 2 weeks ago and for two weeks everything was fine but now it has started to do it again could it be anything different to your alls knowledge?

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Hi, this seams to be the alternator. posibly PARTIALLY SHORTED. (ALTERNATOR REGULATOR draining the battery) TRY AND CHECK THE BATTERY FIRST if the battery is checked on another motor then the chancers it is not the battery. if the BATTERY CAN'T HOLD A CHARGE THEN THIS WILL GIVE A FAULSE DIAGNOSTIC. it will be the alternator or the battery. also if you do short journies this will not charge the battery. the battery will need to be taken off and charged-up (10 hour over night charge, put an old tray under neath as acid may leak) try again and notice if the gages go mental. if they do then the ALTERNATOR is U/S. gerry

Posted on Sep 13, 2010

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Gauges jump around due to low voltage. Get your battery tested, as you can bring it to an auto parts store, as most will test it for free, or better yet...
Get the charging system tested to see if your alternator is charging the battery once it's running.

Posted on Sep 13, 2010

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Please check on the battery, the battery terminals and specially the grounding of the battery to the chassis and to the engine.
Now if there is charge on the battery then it must crank and start.
So a worn out terminal can be the fault, remove clean off crust and tighten.
A weak connection of the battery will not deliver high amperage required for the starter motor. So the voltage drops off.
If so change battery.

Posted on Sep 13, 2010

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Your alternator has failed and needs to be replaced. Please let us know if you need more help.

Posted on Sep 13, 2010

  • Jeff Turcotte
    Jeff Turcotte Sep 13, 2010

    Here is why I say it's the alternator. If you can jump the car, the jumper cables are getting juice to the starter and also to the ignition. Once started, the system can and should run on the alternator. You can disconnect the battery or have a dead battery if the alternator is working, but if the alternator isn't working and there is no battery juice, the ignition will quit as soon as you remove the jumper cables. It may be that the alternator is intermittent and worked OK when tested, but I don't think it's working now. One thing you can check to be sure is that the nut on the back of the alternator holding the red wire on is tight. That wire should go straight to the battery terminal. If that wire is not tight at both ends, the alternator cannot charge the bettery or power the ignition.

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