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so i looked into the service manuals for anything related to charging the auxiliary battery. turns out u guys r partly correct. the aux battery is wired up in series to the main battery and its main function is to provide 24V of power solely (it seems like) for the purpose of "EPS/Electronic Power Steering". the manual also states to put a charger only on the positive terminal inside the engine bay, nth regarding the aux battery. makes me wonder how the aux battery gets charged.
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2011 335is Le Mans Blue
2016 X5 xdrive 35i Alpine White
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