Battery symptoms
Thread Starter
Drifting
Joined: Jun 2012
Posts: 1,391
Likes: 73
Battery symptoms
Is it possible to have a functional battery yet have negative hydrometer results. I used multiple testers and different styles. All said the cells were dead. Volts on bat is 12.5 and load tester for 10 seconds = 11volts. Batt is one year old.
Also, what is the typical current output of the alternator if the battery is charged. I want to check it.
Also, what is the typical current output of the alternator if the battery is charged. I want to check it.
Melting Slicks
Joined: Sep 2013
Posts: 2,264
Likes: 455
From: Stella, North Carolina
Lots of electrical help in these 3 post.
https://www.corvetteforum.com/forums...e-reading.html
https://www.corvetteforum.com/forums...tion-long.html
https://www.corvetteforum.com/forums...nd-issues.html
https://www.corvetteforum.com/forums...e-reading.html
https://www.corvetteforum.com/forums...tion-long.html
https://www.corvetteforum.com/forums...nd-issues.html
Last edited by jdvann; Oct 25, 2016 at 10:09 PM.
Drifting
Joined: Mar 2013
Posts: 1,496
Likes: 355
From: Little Rock Arkansas
^^^ Third link is very important.
Do not, do not, DO NOT, use your current C5 alternator as a core. Most of the remanned and aftermarket "C5 alternators" are actually generic GM crossover parts and thus they do not have the duty cycle function for the PCM. Installation will cause all sorts of electrical issues.
If it turns out to be an alternator issue, either have yours rebuilt or, if you are buying one, make sure the seller knows it's a C5 alternator, not that "it'll work on a C5."
Do not, do not, DO NOT, use your current C5 alternator as a core. Most of the remanned and aftermarket "C5 alternators" are actually generic GM crossover parts and thus they do not have the duty cycle function for the PCM. Installation will cause all sorts of electrical issues.
If it turns out to be an alternator issue, either have yours rebuilt or, if you are buying one, make sure the seller knows it's a C5 alternator, not that "it'll work on a C5."
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
That's why we are WARNING YOU!
More times than not,,, you will get the WRONG ONE! TRUST US!
They look exactly alike but only the GM LS1/6 C5 alternator will work properly!
BC
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Take your car to a alternator / starter repair shop and have them fully test your charging system. Your Battery CCA and Reserve Capacity needs to be in spec to work properly with the cars electronics.
They can also properly test the alternator output voltage and charging current. They need to vary the duty cycle to insure that its able to meet the charging system demands.
Bill
They can also properly test the alternator output voltage and charging current. They need to vary the duty cycle to insure that its able to meet the charging system demands.
Bill
Racer
Joined: Dec 2007
Posts: 298
Likes: 4
From: northridge ca
Listen Up
Dont trade it in. I did and now im paying for it took mine down to autozone and the guy said yea it will work gave them my core wish i had not done that. and now having all kinds of issues. has a new red top optima. looking now to get the valeo alt 
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