BMW 3 Series Alternator Failure — Battery Warning Light
A red battery warning light on BMW 3 Series while driving indicates the alternator has stopped charging. Voltage at the battery with engine running should be 13.8-14.4V. Below 13V confirms alternator failure. The car will run on battery power for 20-40 minutes before electrical systems begin to fail. Pull over safely and arrange recovery. Replacement alternator costs £200-500.
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