Leyland Daf truck question.

I went for a walk in the park today, and there was a display of historic Military vehicles including some current types.

One guy had a Leyland Daf truck. On the dashboard there is a three pin socket and he wonders what it is for and what plugs into it. could it be for a map reading light or some other accessories, does anyone know, please. If so, could you tell me the NSNs of those accessories, please.

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