Question about 2001 Dodge Grand Caravan

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2001 Dodge Grand Caravan battery light is on. Battery and alternator have been checked and are ok. What could be wrong?

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  • kuecs1 Feb 08, 2010

    Sorry, I forgot to mention. The battery light is on with the old alternator and also with the new alternator that was installed. Could it still be a bad diode in the diode bridge?

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  • Dodge Master
  • 6,826 Answers

The alternator has a bad diode in the diode bridge in the alternator,this turns the light on,even though the alternator checks good,and is charging correctly,there is a bad diode,this diode ,along with others,changes ac voltage to dc voltage,if not replaced,it will start causing components to go out.

Posted on Feb 08, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Feb 08, 2010

    Check the voltage at the battery,while it is running,lights on,high blower motor setting,it should read 13.65 volts to 14.25 volts.,,,any thing less is not enough,if it is less,add a wire to the back of the alternator to the positive side of the battery,this will be the large wire.And yes,it still could be a bad diode.This concerns me with a new alternator,so check the output of the alternator on the vehicle,it is possible it is over charging,if so,it will most likely be charging about 15 volts or a little more,with if it is,the e c m will have to be replaced,this is where the voltage regulator is,in the computer.Check this at the battery,with the vehicle running,if it is over 14.65 volts,this will be the problem,I would guess it is charging 15.45 volts,witch is to much,this can cause a lot of component failures.Check it with a volt meter if you have one.

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Feb 08, 2010

    Let me know what you come up with.

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