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If you find that your BMW 1 Series won't start, it may be tempting to think it's just a dead battery. However, the issue could actually be with the alternator. Unlike what you might expect, strange noises like rattling are not typically the first sign of alternator trouble. When the alternator problems affect the engine, you may start hearing worrisome sounds. Usually, drivers first notice issues with their accessories, such as malfunctioning navigation or radio, before more serious symptoms appear.
Issues with the alternator in BMW 1 Series often result in the battery not receiving a charge.