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Battery losing its charge

Tiny
ZOSO3737
  • MEMBER
  • 1986 NISSAN 300ZX
  • 200,000 MILES
So I thought my alternator was going out, because my electrical slowly diminished to the point I couldn't start the car. So I replaced that, it was good for about a day, then the charge started decreasing in the battery and then I lost all electrical and now back to square one? What now? Battery is not quite a year old keep in mind, and its CCA is about 10 less than the one before it.
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Saturday, November 12th, 2011 AT 12:27 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
You need to check for a draw on the battery. If there is none, check the fuseable link between the battery and alt to make sure it is good.
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Saturday, November 12th, 2011 AT 12:29 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Have can you test voltage at battery with car running to see if it's around 14+ volts?
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Saturday, November 12th, 2011 AT 12:37 AM
Tiny
ZOSO3737
  • MEMBER
  • 2 POSTS
Ya, the display on the car initially after replacing the alternator showed about 14 volts, however as the neared the end, it suddenly dropped to 11 volts and eventually died all together.
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Saturday, November 12th, 2011 AT 8:46 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Have the alternator tested at store.
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Saturday, November 12th, 2011 AT 6:30 PM
Tiny
BILLYBOB
  • MECHANIC
  • 27 POSTS
Pull the alternater and take it into the store have them check iy
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Saturday, November 12th, 2011 AT 7:03 PM
Tiny
BILLYBOB
  • MECHANIC
  • 27 POSTS
You can get it started then pull the cable off the positive post if it dies then you know for sure its the alternater
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Saturday, November 12th, 2011 AT 7:15 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Dont leave it off for long as over voltage may fry something in system. I actually dont recommend this maneuver.
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Sunday, November 13th, 2011 AT 12:42 AM

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