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2014 BMW 328xi Sport Wagon, 1984 Avanti 5.0 HO V8
92 Posts

While it may not explain the whole story, the battery voltage you measured sounds rather low, if it was indeed a no-load measurement. A healthy battery with a full charge should read around 14.4 volts or so.

Not true... 12.5v to 12.7v is normal for a fully charged battery measured with the engine not running. 14.4v is typical with the engine running, but the higher voltage comes from the alternator, not the battery.
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