Unattached brown wire

Since I have owned the car there as been a single all brown wire that is not connected to anything. It is clearly an original wire but there is not an end connector on it. It comes out of a wiring harness just behind the windshield wiper motor (LHD car). The brown wire has a black rubber sleeve on it for most of its length and it extends about 3+ feet from the cowl if pulled straight.

I looked at the wiring diagram and I only find one brown (M=maroon) wire anywhere in the engine bay and that is for the oil temperature sender. My oil temp reads fine.

Any ideas what it could be?
Something from a 5-speed that is not used for an auto?
Where is the oil sender unit?
Can someone look under their hood and start behind the wiper motor and see if they find a single wire harness and where it goes?

Thanks and Merry Christmas.
Ken

 

Alastair
It could be the one. I will check it tomorrow. I have no bulb in the fitting and the wire just might be from there.
Ken

 

Ross
My wiring diagram indicates a yellow (G) wire for the plus side of the engine bay light and that is what I have. The wires to/from the hood switch are both black.

Alistair
As above the brown wire is not for the engine bay light.
Ken