For 30 years here on the List we have called it the "silver socket" and it came on VW camper vans from the 60s up to I think 1985 Westy, according to Bus Depot who sells a cable for it.
Silver Socket Power Cable

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Silver Socket Power Cable

Nothing to wire, just plug it in. One end plugs into the Silver Socket on your dash, and the other end is a stan...
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Mark

    On Monday, May 5, 2025 at 05:03:18 PM PDT, Edmund Hintz <ed@hintz.org> wrote:

 Well I'll be darned. You're spot on. I've been looking at that thing
mildly pondering what it is for a few years now. Funny story: Like 4
feet away from it, I've got a BMW R1150RT, and I'm using that for the
float charger that I keep it on when not riding. Just pulled the
connector out, plugged it into the Vanagon, and voila 12.84v. Mystery
solved.

I'd put good money on it being stock, at least for some models. Mine's a
1984 auto Westy, I'm basically 3rd owner and I met the original. His
parents bought it new off the lot here in San Diego..........