I have a mystery wire in my 77 Volkswagen Bus, Westfalia.

I can't figure out where it goes, and have been unable to identify what it goes to.  It is a positive wire, coming out of an inline fuse, right under the steering wheel, it is black with green and white stripe.

Everything works fine, which confounds me even more !

Any help is appreciated:

 

 

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Update - Received a suggestion that this wire looks the one that goes the pump for the sink, tonight I'll trace the sink wiring out and see if it is possible that it leads to that.