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      05-15-2018, 10:04 PM   #6
TLK
Second Lieutenant
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Drives: '14 M5 CP, '12 550i, '04 545i
Join Date: Sep 2016
Location: SF Bay, CA

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If you had searched "f10 hidden menu" and watched the first video that comes up
you would have seen "system voltage" as one of the cluster test options as the guy scrolls by. There's always been a voltmeter reading hidden somewhere, usually in the OBC on the older cars. But it doesn't show without much fooling around. If you've seen different, post a link.