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Battery light is ON

Posted on 2011-09-12
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Last Modified: 2012-05-12
Check at advance auto parts and give me the report says:
Starter: Cranking Normal
Charging System Test: NP
Battery Test: Good Battery 12.83v

I take off the +ve wire but alternator was still working. +ve wire is still off from the battery may be its a computer malfunction. I dont know needs help.
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Question by:mustish1
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by:tomago
ID: 36526726
What is the voltage the alternator is putting out?
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by:mustish1
ID: 36526767
I don't know that. Guy at advance auto parts unplug the positive terminal from the battery and tell me that your alternator is working otherwise it stops.
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by:tomago
ID: 36526784
Yes, alternator is working, but it could be starting to go.  Check the voltage across the alternator to make sure it's a consistent 12+ volts.
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by:mustish1
ID: 36526877
How to test the voltage around the alternator
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tomago earned 167 total points
ID: 36526895
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by:mustish1
ID: 36526904
That's what the advance auto parts guy did it and also give me a paper printout. I will goto autozone tomorrow may be they tell me different story.
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by:Tiras25
Tiras25 earned 167 total points
ID: 36526940
Nice way to smoke the computer on today's cars.  "+ve wire is still off from the battery may be its a computer malfunction."
There certainly will BE a computer malfunction now!

Replace alternator and regulator, locate wiring diagram, check electrical circuits to each side of idiot light.  Never remove battery or alternator wires when vehicle is running, unless you like buying new modules.  Does 'Charging System Test:NP' mean 'not performed', by any chance?



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by:mustish1
ID: 36526995
Np means no problem
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by:Michael-Best
Michael-Best earned 166 total points
ID: 36527717
First check all your fuses.

How to check your aternator & charging system:
(A very good guide)
http://www.aa1car.com/library/charging_checks.htm

Hpe ths hlps.
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Author Comment

by:mustish1
ID: 36529318
Ok. I crank it today in the morning. Light was blinking for few minutes and than disappear. I remember i had 89 chevy caprice (box)  and one day when i look inside the hood the motor fan was dancing. I take it to the mechanic and he told me the alternator is dying. I drove expedition for like 20 minutes and touch the alternator it was hot but not that hot that i cant touch it. fan was also looks like running normal not like my old box car.
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Expert Comment

by:dhsindy
ID: 36530775
How old of vehicle are we talking about here?

Something in the charging circuit is defective.  Besides major componets look for bad or loose belt, and bad or loose wires.
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Expert Comment

by:Tiras25
ID: 36531538
Weak alternator do you have a tester so you can see the voltage the alternator is giving off?  It could be a weak alternator not charging correctly or it could be charging irregularly.  Does the voltage gauge move when you turn your lights on?

Also.. Diodes?  In my old GM the battery light would come on and flicker with bad diodes (in alternator) even though the charging output voltage was normal .
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Expert Comment

by:Michael-Best
ID: 36532644
Did you read this?
How to check your aternator & charging system:
(A very good guide)
http://www.aa1car.com/library/charging_checks.htm
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