What type of indicators do you have on the trailer.  My camper has LED's and so the trailer light doesn't flash any differently to the single flash when you turn the indicators on if the trailer wasn't connected.  The way the system works is by detecting sufficient current draw on the indicator circuit, so if the trailer system isn't drawing enough power (e.g. 5W bulbs or even worse LED's) then it won't think it needs to activate.
				
			 
			
		 
			
				
			
			
				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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