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battery keeps going flat !
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Old 05 Apr 2009, 10:09 PM   #1 (permalink)
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battery keeps going flat !

03 wrx sti is only charging battery at 12.6 volts, i disconnected the small blue wire from the alternator and it is now charging the battery at 14.6 volts, but the engine managment light is on, anyone know whats wrong ?
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Old 06 Apr 2009, 01:46 AM   #2 (permalink)
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Re: battery keeps going flat !

Hi Their how long is the battery in the car and when engine running test the alternator with all electrics on in car heating, lights, rear defogger, everything and check the reading then and see shouldnt have dropped by much the reading or at all if a good alternator 14.6volts is good but is it with load or without also I would get the managment light checked for the fault code/s
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Old 06 Apr 2009, 10:17 PM   #3 (permalink)
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Re: battery keeps going flat !

hello stiimpreza 1984 thanks for reply. The battery is only 3 months old and i got it checked last week in case it was faulty, it was all right. I also tested the alternator with everything swiched on (lights AC heater back window demister) it puts out 14.6 volts except when the small blue wire is connected. The engin managment fault code is P0558 which is the brake boster pressure sensor, if i reconnect the small blue wire the voltage at the battery drops back to 12.6 volts and my battery goes flat in a day or two. Any other ideas?
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Old 07 Apr 2009, 02:15 AM   #4 (permalink)
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Re: battery keeps going flat !

Quote:
Originally Posted by davemc View Post
hello stiimpreza 1984 thanks for reply. The battery is only 3 months old and i got it checked last week in case it was faulty, it was all right. I also tested the alternator with everything swiched on (lights AC heater back window demister) it puts out 14.6 volts except when the small blue wire is connected. The engin managment fault code is P0558 which is the brake boster pressure sensor, if i reconnect the small blue wire the voltage at the battery drops back to 12.6 volts and my battery goes flat in a day or two. Any other ideas?
12.6v very weak no wonder it dont charge battery. Id get the sensor fixed anyway and this blue wire what is it coming from and where did it plug into? Is it like mine in this pic with connector on it bear in mind I dont have A/C?
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Old 07 Apr 2009, 07:16 PM   #5 (permalink)
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Re: battery keeps going flat !

The small blue wire comes from the green plug on the alternator
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Old 07 Apr 2009, 10:58 PM   #6 (permalink)
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Re: battery keeps going flat !

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Originally Posted by davemc View Post
The small blue wire comes from the green plug on the alternator
Strange get it looked at fella
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