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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 05-10-2005, 07:32 AM   #1
adam519
 
Join Date: May 2005
Posts: 16
Default My battery wont charge

Hey folks hope someone can help here... I have an 88 GT converted to mass air and out of the blue i developed a charging issue...

I have tried 4 alternators to no avail, with car at idle and thru RPM range the battery reads 11.85v and then with the car turned off it reads 12.10 or slightly higher or lower. There is a lil square device on solenoid, is that an external volt regulator?

Anyhelp is appreciated

Regards

Adam
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Old 05-10-2005, 10:41 AM   #2
hawkwitastang
 
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Default RE: My battery wont charge

Where's the little square device you're talking about? If your cars an '88 then it wont have an external voltage regulator unless someone added one for some reason or another. If your battery is reading 12.10v when the car is off you could clean the terminals and check your battery cables for corrosion wherever they're connected. 11.85v when the car is running isn't bad.
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Old 05-10-2005, 01:05 PM   #3
adam519
 
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Default RE: My battery wont charge

Ok the square box thingie is on the battery side of the solenoid as opposed to the starter side! As for the 11.85, that is with nothing running, my battery will die shortly after turning devices on as the charge is insuffecient.. that is atleat my theory....

one note, i have since cleaned all underhood grounds, cleaned terminals and posts also have aftermarket ground cable and I cut that and provided an oxidation free feed from the ground.... i am at wits end with this problem....

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Old 05-10-2005, 01:22 PM   #4
vfast
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Default RE: My battery wont charge

can you post a pic of the box
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Old 05-10-2005, 01:55 PM   #5
adam519
 
Join Date: May 2005
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Default RE: My battery wont charge

sorry its a bit blurry hard to stablizie a 75-300 lense!

[IMG]local://upfiles/16655/C644EA56E41B4D52B72177D41DB3BEAA.jpg[/IMG]
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Old 05-10-2005, 02:02 PM   #6
adam519
 
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Default RE: My battery wont charge

here is a better image

[IMG]local://upfiles/16655/DA519B42170A4CA981ED3E39B2835C63.jpg[/IMG]
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Old 05-10-2005, 02:12 PM   #7
mustang8719
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Default RE: My battery wont charge

Make sure the fusible link isn't burnt and the car is just running off the battery till it dies.
The fusable link is by the solenoid.
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Old 05-10-2005, 02:19 PM   #8
adam519
 
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Default RE: My battery wont charge

dont know what that box is, but with or without still hardly any juice while car runs... interesting note.... THE AMP light is on while the car runs....
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Old 05-10-2005, 02:22 PM   #9
adam519
 
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Default RE: My battery wont charge

damn wish I knew how to test the fusible link... have oftten wondered about that... and where beside solenoid is it? Is it attached to a wire attaching to the solenoid??

thanx so much guys
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Old 05-10-2005, 02:26 PM   #10
mustang8719
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Default RE: My battery wont charge

It attaches to the solenoid.If it burns it usually burns in half.Feel the wires coming off the solenoid and see if any feel empty.I will check in a few on my car to see which color it is.
As soon as I know I will post it for you.
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Old 05-10-2005, 02:26 PM
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