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Hi my girlfriend has 2009 g8 v6 with a battery light on ,I have changed the alternator , battery ,belts and checked connections. Everything tested good ,but yet the battery light will not go off. Is there something else I am missing, like a fuse or sensor that would keep that light on.
 

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With only 1 post, its hard to guess what vendor components you put in the car. So I can only tell you to try this for now. Get the engineering page displayed on the DIC, and select battery voltage info. You should see a volt reading of something like 11.7 to 12.1 Start the car an see if the voltage reading ramps up to approx 14.7 in about 4 seconds. My battery icon remains illuminated until that voltage nears that 14 volt threshold point. If you put in a rebuilt or alternate sourced Alternator in that car (instead of a *new* GM OEM unit) you are almost guarantied to be in a peck of trouble (voltage output wise).
 

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My alternator went bad at around 140k not long after installing an UD Pulley. It gave the Battery/Alternator warning periodically & eventually stayed on permanently. Autozone was the only place that had one locally. It was a Rebuilt unit that after installed the headlights flickered badly. Ended up returning & buying a used one *Normally wouldn't recommend* on ebay for 35$ shipped & it works perfectly! No more warnings on the DIC.
 

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...Ended up returning & buying a used one *Normally wouldn't recommend* on ebay for 35$ shipped & it works perfectly!...
That's a pretty darn good deal for a used alternator shipped to the front doorstep. Perchance is it an AcDelco unit?
 

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The used one looked exactly the same as the stock unit I was replacing. I'll definitely go with a brand new Acdelco unit next time.
 

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It's entirely possible that my used Alternator could be an Acdelco unit that's been rebuilt at least once in its lifetime. If memory serves me right it came from a car with 140k or so miles. Still way better than Autozone rebuilt garbage.
 
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