WHY WOULD THE 100 AMP BATTERY FUSE BE BLOWING?

  • Tiny
  • Jack Jennings
  • 1999 Nissan Altima
  • 142,000 miles

Why would the 100 amp battery fuse be blowing. I know it has a short, but what feed off of this. None of the smaller fuses blow.


Saturday, October 6th, 2012 AT 9:06 PM

2 Answers

  • Tiny
  • caradiodoc
  • Expert
  • 24,890 posts

That circuit usually leads to the generator's output terminal. Measure for voltage there. If it's missing, disconnect that wire, then measure for continuity to ground from the wire and from the output terminal. If you read continuity to ground on the output terminal, replace the generator. If you read it on the wire, look for a place it's rubbed through and grounding out.

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Saturday, October 6th, 2012 AT 9:19 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,938 posts

The 100 A fuse is the main fuse for many components but since othere smaller fuses are not blowing, the one that mainly feeds off it would be the charging system, meaning the alternator. Disconnect the alternator main wore and tape it up and test if it shorts.

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Saturday, October 6th, 2012 AT 9:26 PM

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