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Alternator Won't Charge

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Old 04-20-2014, 08:39 AM
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Default Alternator Won't Charge

Alternator wasn't charging, replaced it along with throw an Optima in there. Worked great for about an hour, won't charge again. Put a new pigtail on, exciter wire is at about 9.6 V. Should it be 12 V? Any other ideas?
Old 04-20-2014, 11:42 AM
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Yeah, your "new" rebuilt alternator probably took a dump already. Take it to Autozone or wherever you bought it from and have them test it.
Old 04-20-2014, 01:02 PM
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The exciter wire only has 9.6 volts because your system only has 9.6 volts due to your alternator not charging. They both go hand in hand. It's there initially to "kick start" the alternators charging process.

As lt1pwr said, its the alternator. The "new" ones are all rebuilds, probably took a dump on you.
Old 04-25-2014, 06:47 PM
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Originally Posted by luigiandme
The exciter wire only has 9.6 volts because your system only has 9.6 volts due to your alternator not charging. They both go hand in hand. It's there initially to "kick start" the alternators charging process.

As lt1pwr said, its the alternator. The "new" ones are all rebuilds, probably took a dump on you.
I have heard the voltage to the exciter wire changes, based on what is needed. Is this true? Also, can you simply hard wire the exciter wire with a constant 12v... say for a drag car that sees very little street driving, but still some? Would that solve the issue of the alt only putting out the common 13 volts a lot of guys are seeing?



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