Red wire connects to the vehicle's brake light supply.
Blue wire connects to the trailer brake wire (blue wire in the trailer plug).
Connect the black direct to the +ve on the battery and the white to the -ve of the battery.
The red supplies the signal to say brakes applied, the blue supplies the output to the trailer's brakes.
Sneigy wired my RedArc in so if you send him a PM he may be able to help.
I'm very happy with the RedArc unit.
				
			 
			
		 
			
				
			
			
				MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
			
			
		 
	
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