13.5-14.5 Volts is the typical charging Voltage of most modern vehicles.

There is an exception to some models, not the E70, that the engine control computer will actually turn off the alternator as a fuel savings and performance boosting measure. These vehicles usually have a current loop on the output of the battery and/or alternator to monitor power usage so the computer can control the alternator.

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2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim.