Question about 2000 Jeep Grand Cherokee

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Put a new alternator in 2000 Jeep Grand Cherokee engine light on

My Jeep did not start one day until I got a jump. The jump started the engine. After that I went to get my battery tested, and it came back good. The alternator came back bad. I put the new alternator in the jeep and 2 days later, my car hesitated to start. Although it did start, The check engine light came on. any idea what the problem is now?? Help

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  • Anonymous Mar 30, 2014

    I have had this car checked from top to bottom--it can start at 9 am and go out at 11 am and will not start. Sometimes it will got for 2 days and then will not start.

  • Steve lock
    Steve lock Apr 27, 2015

    how long did you let car run after new alternator ??? you may have not gotin a full charge

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  • Jeep Master
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Well , the ECU runs the alternator. (DG wire "dark green")
the alternator field is controlled 100% by PCM reg , inside PCM.
so..... if the running engine has 13.3, to 15vdc the alt is working
if lower, its not. (rpm on engine 800 or more)

not scanning the PCM a the CEL glow, you missed the boat.
why not scan it. see why the PCM is upset (DTC errors stored)

see the 2 lower pins below , those go to PCM.
in theory if the field in the old BAD ALT, was shorted.
that could in fact, burn up the PCM regulator.
shorting outputs of PCM , does that in most cases.
im the poor sod that fixes PCM's.so....

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Posted on Apr 28, 2015

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  • Jeep Master
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If the battery is been tested and is good then the ALT .must be chargeing it .
Try these 2 tests volt meter veh. running top bat . terminals 20 V dc scale B to B R to R you should at least 13 dc v 14 to 15 v is better but if your over 13 the ALT is chargeing the bat .
# 2 test disconnect the NEG. cable from the BAT. meter on same scale 20 v dc .Go R to R on BAT. and B to engine ground engine block any metal that isn't painted that bolts to the engine or frame .
If you read voltage you have a short someware in the vehicle .The B+ side hot power is comeing in contact with the negitive side ground .With the negitive cable disconnected from the battery their should be no path so the problem is something that bolts to the engine or frame must be shorting interinally .
My best guess would be the starting motor see what you get because all I can do is guess at this point .

Posted on Apr 27, 2015

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  • Jeep Master
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Test the alternator charging capability by connecting a volt meter to the battery terminals and starting the engine. The voltage should be at least 13 VDC.
If it's less it will not charge the battery enough.
Hope this helps.

Posted on Mar 29, 2015

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Ive had this similar problem in the past with my 2000 Grand Jeep Cherokee. Ive found by putting the Jeep in neutral ...it started right away. Good luck

Posted on Apr 08, 2009

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