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Old 11-18-2012, 07:27 PM   #1
prezarevo
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Member#: 266930
Join Date: Dec 2010
Chapter/Region: Tri-State
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2002 WRX
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Default Another "alternator wont charge battery" thread

The problem is " the alternator will not charge the battery ". Vehicle is a 96 impreza. I drove this car for 3 years with no issues of this sort. I sold it to a friend. He sawps it to a 5 spd, drove it for 3 days and now hes presented with this. He put two different alternators in it and still no charge output to the battery. The battery is brand new. The orginal alternator was in fact bench tested and proved to work just fine. He replaced all the fuses under the hood. ( poke and hope ). He even tested the wires on the alternator when the car was at idle and nothing was being " sent out. " Also, i put many grounds on this preza when i owned it and the main ground wires was cleaned twice. As I've read many of threads about this same issue. Most common answer is check your battery light. Well, that light works just fine. Someone please shoot me....some suggestions. Im not an electrical tech so if any testing IS suggested, i will ask that the responder holds my hand through the procedure. So thank you for reading and responding if done so.
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Old 11-18-2012, 07:46 PM   #2
Cougar4
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2001 LL Bean Outback
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To verify the field lead is working ok disconnect the connector on the back side of the alternator. Then turn the key to the RUN position and check the battery warning light on the dash, it should be turned off. Then reconnect the alternator plug and verify the battery warning light is on. If that checks out then the alternator will have power to the exciter and should generate power. Check the voltage on the main output stud of the alternator and see if you have more than 13 volts there while the engine is running at about 1,200 RPM. If that is ok then measure the voltage between that point and the positive battery post. If there is more than .3 volts difference then there is a problem with the connection. Check the fuse.
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Old 11-26-2012, 09:35 PM   #3
prezarevo
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2002 WRX
PSM

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Thanks for responding coug. We found the issue...sooo damn stupid. Soo soo sooo damn stupid. But simple it was..a really dirty fuse. Not a fried wire, alternator, bad axle, missing trim button, but an EXTREMELY dirty fuse. Das it. So all apologies to those that wasted their mind strength on reading this thread.
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Old 11-28-2012, 04:13 AM   #4
Cougar4
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Glad you found it. Thanks for the update.
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Old 11-28-2012, 12:09 PM   #5
Aaron'z 2.5RS
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90% of the time, it's the simple stuff... 90% of THAT time it's 100% harder to SEE that..lol..
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