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Charge System Fault?

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Old Apr 1, 2007 | 01:03 PM
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Default Charge System Fault?

My diagnostics screen is flashing Charge System Fault. I have replaced the battery and the alternator. The original alternator was charging 12.9 at its peak. The new alternator charges at around 13.1-13.6. We have checked the grounds. Any other ideas?
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Old Apr 1, 2007 | 01:22 PM
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Do you have any aftermarket audio/video installed? Try the big 3 upgrade. Can be done for under $20 and about 1 hour of tme.
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Old Apr 1, 2007 | 01:30 PM
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What is the big 3? I do have audio upgrades plus electric cut outs. I think the flash happened after the cut outs were installed.
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Old Apr 1, 2007 | 03:09 PM
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Here is an overview of audio FAQ is HERE

It makes your stock electrical system work more efficiently.
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Old Apr 1, 2007 | 08:41 PM
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Any other thoughts on this?
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Old Apr 1, 2007 | 09:13 PM
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Do you have an underdrive pulley?
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Old Apr 1, 2007 | 09:24 PM
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Yes! Perhaps I would need an over sized pully for the alternator.
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Old Apr 1, 2007 | 09:27 PM
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Here's some info which might help:

http://forums.corvetteforum.com/show....php?t=1530169
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Old Apr 1, 2007 | 09:38 PM
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Thanks! I'll pass this info. on to the tech.
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Old Apr 1, 2007 | 10:09 PM
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I think he just read it
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Old Apr 2, 2007 | 11:56 AM
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Originally Posted by 97Rob
My diagnostics screen is flashing Charge System Fault. I have replaced the battery and the alternator. The original alternator was charging 12.9 at its peak. The new alternator charges at around 13.1-13.6. We have checked the grounds. Any other ideas?
Check the positive terminal connection at the starter (under passenger side header). I had the same problems and mine looked like this:

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Old Apr 2, 2007 | 01:37 PM
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We had the engine out Sunday fixing an oil leak. The starter and its connections looked good. Thanks for the input.
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Old Apr 2, 2007 | 07:31 PM
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Originally Posted by 97Rob
We had the engine out Sunday fixing an oil leak. The starter and its connections looked good. Thanks for the input.
Where was the oil leak (out of curiousity)? I have one myself.
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Old Apr 2, 2007 | 07:37 PM
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c5's are very picky on which alt you use. id do a search on the subject
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Old Apr 2, 2007 | 08:25 PM
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I have received this warning twice after starting my car in the last 3 month's I've owned it. Each time the voltmeter actually showed a slight over volt (15+) but not high enough to hurt anything. the battery needed replacing anyway so I did that. No problems since then but I'm not sure if its related.
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Old Jun 24, 2007 | 02:50 PM
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Default Charge System Fault

After letting my car sit for a week I disconnected my 1.5 amp battery tender which showed a full charge. Upon starting , I got the infamous Charge System Fault which disappeared and has not resurfaced. No prior problems, the battery is the original, 2004 C5.

Could I have overcharged the battery? Shows 13.8 volts while driving.

Any comments or opinions will be appreciated.

Thanks
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