Question about BMW 323

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I have a 2000 BMW 323i anaysd my charging system is not charging my battery . i removed the alternator from car and had it bench tested and it PASSED the charging test on the machine at the auto parts store . When installed on car the battery light stays on and there is no charging taking place . You only get a reading of battery voltage with the car runing . I INSPECTED ALL CONNECTORS AND WIRING . CAN YOU HELP . DO YOU HAVE THE TROBLESHOOTING INFO FOR THE CHARGING SYSTEM , ALONG WITH THE SCHIMATIC FOR THIS PROBLEM .

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If you plan to diagnose this yourself you can go to or mitchell1diy (search) and you can get all the info you need.

The charging system is computer controlled. If you have 12volts on the big wire then the fuse is not popped. You prabably havea computer issue. Also with the car running do you still have the same voltage as with the car off. . You will need a digital meter to diagnose this yourself.

Posted on May 15, 2010


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