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alt not charging battery but alt in testing good

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Old May 24, 2010 | 11:43 AM
  #1  
IfknROC85's Avatar
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From: New York, Weedsport
Car: 85 iroc z28
Engine: 305 tpi
alt not charging battery but alt in testing good

any help would be nice....my altinator is testing good from my local auto store but i cant figure out why my alt is not putting any power to my battery is my wiring wrong or or something else please help
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Old May 24, 2010 | 01:57 PM
  #2  
305sbc's Avatar
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From: Fairview Heights Illinois
Car: 1986 Irocz
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.25:1
Re: alt not charging battery but alt in testing good

Originally Posted by IfknROC85
any help would be nice....my altinator is testing good from my local auto store but i cant figure out why my alt is not putting any power to my battery is my wiring wrong or or something else please help

The power wire from the alternator usually goes down to the large positive post on the starter where the battery cable connects.
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Old May 24, 2010 | 10:44 PM
  #3  
travis401's Avatar
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From: Arlington, Tx
Car: 91 Camaro RS
Engine: empty bay (for now)
Transmission: Built T-56
Axle/Gears: 3.42 stock posi disc
Re: alt not charging battery but alt in testing good

Have your battery tested, it may just not be able to hold a charge. If that checks out then its got to be a wire issue.
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Old May 24, 2010 | 11:00 PM
  #4  
IfknROC85's Avatar
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From: New York, Weedsport
Car: 85 iroc z28
Engine: 305 tpi
Re: alt not charging battery but alt in testing good

the battery is a week old but we just noticed it wasent getting a charge back to it yesterday....haha when the car lost juice on a test run.....so we could of smoked the battery so that might be an issue...im going to check the starter......my volts gauge shows it at 13v when i start it and slowly drains down to under ten
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Old May 25, 2010 | 11:04 AM
  #5  
305sbc's Avatar
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From: Fairview Heights Illinois
Car: 1986 Irocz
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.25:1
Re: alt not charging battery but alt in testing good

Originally Posted by IfknROC85
the battery is a week old but we just noticed it wasent getting a charge back to it yesterday....haha when the car lost juice on a test run.....so we could of smoked the battery so that might be an issue...im going to check the starter......my volts gauge shows it at 13v when i start it and slowly drains down to under ten
the power for the factory voltmeter comes from a fuseable link that also goes down to the positive post on the starter.

Likely problems are loose connections at the starter, and/or a bad cable between the alternator and starter, and/or a bad large cable between the battery and the starter.

There is a possible chance that you have a bad or damaged battery, but that chance is pretty low.
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