2000 Honda Civic Si Alternator Fuse Blows

HONDA CIVIC
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DONALDWW1
  • MEMBER
  • 1 POST
i have a 2000 civic si, and everytime i go to crank the car the alternator fuse blows. i have not had the alternator tested but would a bad alt make the fuse blow before the car was running. i turn the key and when i get to the last acc before the start the fuse blows. no work has been done to the cars electrical system. i am stumped. does anyone have any ideas. again this is the stock alt. so could a bad alt make a fuse blow, please i need some help....thanks..by the way the battery is fine and the grounds are good...
Jan 26, 2006 at 5:36 AM
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BLUELIGHTNIN6
  • ✓Experienced Mechanic
  • 16,542 POSTS
Suspect fauty voltage regulator. The regulator is built into the alternator and when it fails, it cannot regulate the amount of volts being put out by the alternator which in turn blows the fuse.



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Mar 4, 2009 at 1:20 AM

Suggested Repair

Have the alternator tested, focusing on the internal voltage regulator. A failed regulator can allow uncontrolled alternator output and blow the alternator fuse; replace the alternator if the regulator has failed.

Conversation Summary

The owner of a 2000 Civic Si reports that the alternator fuse blows when the key is turned to the last accessory position before starting. The battery and grounds are said to be good, no electrical work has been done, and the stock alternator has not been tested. The expert suspects a faulty voltage regulator built into the alternator, which can fail to regulate output voltage and blow the fuse.

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