Question about 2004 Jeep Grand Cherokee

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New alternator (actually 2 new) no charge

1995 Jeep Grand Cherokee 5.1 enginge.
Check engine light came on, noticed that battery indicator showed no charging happening. Usually displays about 14, was under 9. Out of town unable to get into a shop so bought a new alternator on dealership recommendation. "Faulty" alternator would charge, then drop, charge, drop, the whole way home. Made it home, put new alternator in and bam, no charge. Needle drops all the way down when jeep is shut off but only goes up to just under 9 when running. Took that alternator out, traded it for another new one and same thing. Got mad, went back and got original alternator and put back in. Same thing. No charging yet but have become an expert at putting the blasted things in and out. Can't find a loose ground but it might be a possibility. In Minnesota and cold temperature is making things very difficult.
Thanks for any suggestions.

Posted by on

  • fishychris Dec 20, 2008

    Any suggestions on how to find where the wires go once they leave
    alternator and enter into the wiring harnesses? I will definately
    try to locate the short but feel stupid for not knowing where wires go.


  • fishychris Dec 22, 2008

    Finally got it but it was not in the wiring or the battery.
    Located the problem in the power distrribution box. The 60 amp
    fuse which supplied the alternator with power (#1) was blown. If
    I had been more knowledgeable on such matters I imagine I should have
    checked this out first. Maybe this post will help other newbie

    If you're having trouble with blower fan etc. it's a good place to
    start looking since there are fuses for quite a few things on the box.



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  • 63 Answers

Find a friend with a heated garage that you can use first off, then locate the short that may be causing all this. Unless you have a bad battery? If its more than 3 years old, replace it. Batterys are cheap. WALMART has em under 89 bucks for most vehicles.

Posted on Dec 20, 2008


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1 Answer

Battery going dead. shows check engine light

If you battery is going dead and the check engine light is on then you alternator is going out. Heres what to do, replace the battery and have the charging system check by a local repair shop. If you alternator is bad it will cause the battery to go bad as well, so testing the vehicle with a dead battery will not bring back any accurate results. An altornator is in charge of keeping you'r battery charged to sustain enough power for you vehicle. If you replace the battery and the problem persist, then you have a short or current draw in the system causing the battery to drain. If thats the case go and see a specialist and have them do an electrical diagnosis.

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Hello and welcome to FixYa!

If the battery light is on, I strongly suggest that you have the battery charged. It can be an indication of a weak battery or a faulty alternator. If the battery light still on after charging then the problem will surely be on the alternator itself. If that's the case the alternator should be replaced to resolve the problem.

If the battery won't hold charge even on a new alternator then the problem will be on the battery itself. It surely is in the end of it's service life and replacement will be necessary.

You may try to reset it to by removing the positive battery connector, letting it sit for at least 5mins. then reconnect it again. This will reset the system and can get the battery light off.

Hope this helps and thank you for using FixYa! Have a good one!

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