Question about 2000 Mazda MPV

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My 2000 Mazda MPV battery dies after several hours because of a parasitic current of between 3.5 and 6A. I pulled all fuses and without any decrease. Battery is 3months old. I had both the battery and alternator tested in by AAA and at Pepboys both fine. Since they tested it the Alternator voltage has increased from 15V to 18V. Any suggestions?

Posted by Anonymous on

  • Anonymous Jan 05, 2011

    Both the current draw and excessive charging voltage were caused by a bad alternator. Replaced the alternator and the problem was gone.

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  • Mazda Master
  • 1,348 Answers

The alternator has a connection directly to the battery and so does the starter.you have to look at the schematic and one circuit at a time remove all the "hot at all times sources to eliminate what is drawing current.my first guess would be a shorted diode inside the the alternator.disconnect the big terminal on the alternator and see if the draw goes away.A bad ignition could be a possibility,as well as a bad brake switch,or a fuel pump that is running continuous.That is a serious amount of current.best of luck with it.

Posted on Jan 03, 2011

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3_19_2012_6_41_46_pm.jpg

3_19_2012_6_42_13_pm.jpg

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