z168, I'll look this weekend for it. I don't remember seeing it, but I just got the build sheet and the comment was I have one from factory. the register owner for the 8's said this was a very odd/rare thing to have on the car.

"This (referring to my car cb00168) and CB00169 were the only cars of the whole E31 production that had
a battery mains switch installed. Maybe others had it installed too only
the option S818 was never again in use."

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S