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How to troubleshoot a BMW 3 Series charging system?

I recently noticed that my BMW 3 Series is having trouble starting and the battery indicator light is on. What steps should I take to diagnose and fix the issue?

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K

First, check the battery voltage using a multimeter. If it's below 12.4 volts, it needs to be recharged. Clean the battery terminals and cables and check for any loose connections. You may also want to have the battery tested at a repair shop or dealership.

S

If the battery is in good condition, the next step is to check the alternator. Use a multimeter to test for proper charging voltage (around 13.8-14.4 volts while the engine is running). If it's low, it may need to be replaced.

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