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I know you want to know what it is...but...
I looked at my car (1965). Clues are: grommet is there, no wire. High/low beams/indicator work no issues. Horn works. I do not have cruise/AC/transistor ignition.
Possibility is someone used existing hole to bypass bad wire/socket and didn't label or color code wire just used 'black'. I looked quickly through WDs for 65 and couldn't ID but could be the horn.
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