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General E46 Forum
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Old 03-18-2013, 08:47 AM   #1
JTripper
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Battery change

Just changed my battery today, still have the battery light on though! Whats up with that, does the battery need to be coded or something?
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Old 03-18-2013, 09:12 AM   #2
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Just changed my battery today, still have the battery light on though! Whats up with that, does the battery need to be coded or something?
One possibility is some new batteries lose full charge sitting on a shelf. That would make the light stay on. Also, you might need an alternator. Take it to Autozone or Advance Auto parts and have them do an electrical system test.
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Old 03-18-2013, 09:36 AM   #3
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One possibility is some new batteries lose full charge sitting on a shelf. That would make the light stay on. Also, you might need an alternator. Take it to Autozone or Advance Auto parts and have them do an electrical system test.
Ooooh lord i hope not but that does sound possible! Thanks for the input
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Old 03-18-2013, 09:37 AM   #4
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Would my PA soft scanner pick up the diagnosis?
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Old 03-18-2013, 09:46 AM   #5
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Would my PA soft scanner pick up the diagnosis?
That's worth a try. It may be more specific than just a light.
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Old 03-18-2013, 10:11 AM   #6
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The light should go off almost immediately, whether the battery is charged or not. You need a voltage regulator at minimum, preferably a new alternator.
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Old 03-18-2013, 10:20 AM   #7
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Quit guessing around

Get in there and use the OBC hidden functions to monitor your voltage both before the car is started and after the car is running.
You need an alternator output of around 14v when running to be healthy.

Last edited by Stinger9; 05-08-2014 at 05:39 PM.
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Old 03-18-2013, 10:33 AM   #8
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Probably your alternator is bad.
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Old 03-18-2013, 01:58 PM   #9
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Probably your alternator is bad.
Dammmmn E you called! Right you are! Phucccccck man!!!
Just check voltage its sitting under 12v at 11.8v

Smmfh! Repair Warranty here i come!!
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Old 03-18-2013, 09:33 PM   #10
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Dammmmn E you called! Right you are! Phucccccck man!!!
Just check voltage its sitting under 12v at 11.8v

Smmfh! Repair Warranty here i come!!
Been there, done that. Replaced alternator myself within an hour. Pretty easy if you ask me.
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