That will be for the heated screen. Powered by relays from signals from the Body Control Module so will not be permanently or ignition powered, but worth checking.
As the wires are just above the main internal junction/fuse box, I'd be taking power from that. It's easy to get to. You have a choice of permanent or ignition power. There's heaps of room behind the left dash end. May as well put in a usb port at the same time powered from the same wire.
Glovebox usb.jpg
				
			 
			
		 
			
				
			
			
				2013 D4 expedition equipped
1966 Army workshop trailer
(previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue, 1993 LSE 3.9V8 then HS2.8)
			
			
		 
	
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