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A little help please...

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Old Aug 4, 2011 | 10:18 PM
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Default A little help please...

I decided to have my alternator powder coated black. I took apart the alternator following tips that I found in a search here on the forum. It came apart fairly easy and went back together the same. Now when installed I get low voltage. It now idles around 11 volts whereas prior to the project it hovered around 13 to 13.5 volts. Any ideas?
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Old Aug 4, 2011 | 10:24 PM
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Forgot to add the alt. was fully disassembled before powder coated.
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Old Aug 4, 2011 | 10:24 PM
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Originally Posted by JJ 86
I decided to have my alternator powder coated black. I took apart the alternator following tips that I found in a search here on the forum. It came apart fairly easy and went back together the same. Now when installed I get low voltage. It now idles around 11 volts whereas prior to the project it hovered around 13 to 13.5 volts. Any ideas?
Yep.....it's probably not grounded anymore. Make sure the contact points are free of powder coating.
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Old Aug 4, 2011 | 11:00 PM
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When you say contact point are you talking about the mounting ears of the alt.? I did remove the powder coating from both sides of the each ear for both mounts. Still no luck. We masked off the area where the voltage regulator mounts to the rear housing as well as masking off the areas where the bearings ride. As of right now I am out of ideas.
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Old Aug 4, 2011 | 11:07 PM
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It is my understanding that the alt. grounds from the mounting points on the alt bracket. Is this truly the case? If not, where are the grounding points?
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Old Aug 5, 2011 | 01:50 AM
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Bad ground. Philly joe
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Old Aug 5, 2011 | 07:37 AM
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In addition to the grounding point suggestions make sure the three nuts under the plastic housing are snug.

I once had symptoms like yours when I had my new alternator painted and found these to be loose. Tightening them up corrected the issue for me.

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Old Aug 5, 2011 | 08:31 AM
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Originally Posted by JJ 86
Is this truly the case?
Yes, no pun intended......
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Old Aug 5, 2011 | 10:57 AM
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I posted this link in your other thread (http://forums.corvetteforum.com/c5-t...r-the-alt.html) too... It's easier if you stick to one thread per issue.

http://forums.corvetteforum.com/1557187612-post5.html
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Old Aug 5, 2011 | 12:11 PM
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Have you tested the alternator outside of the car? Have it tested at your local auto parts or alternator repair shop. In short, test it in a different environment.
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