battery light goes on and off

2002 MAZDA 626
122,000 MILES • 4 CYL • 2WD • AUTOMATIC
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CHAMPEVANS
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  • 1 POST
I have an Mazda 626 2002. the battery light goes on and off. the battery tested good and the alternator is a year old. what might be the cause
Apr 13, 2011 at 8:24 AM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
suspect diode failure in alt rectifier bridge
Apr 13, 2011 at 8:27 AM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
Docfixit is most probably correct but check for bad ground circuit connections. A broken alternator bracket would result in that. The other possible cause would be a bad crank pulley if equipped with harmonic damper, which has failed.
Apr 13, 2011 at 11:22 AM
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