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Battery light goes on and off

Tiny
CHAMPEVANS
  • MEMBER
  • 2002 MAZDA 626
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 122,000 MILES
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
Wednesday, April 13th, 2011 AT 3:24 PM

2 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Suspect diode failure in alt rectifier bridge
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Wednesday, April 13th, 2011 AT 3:27 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 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.
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Wednesday, April 13th, 2011 AT 6:22 PM

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