The adaptor thingy for 2x7 pin sockets was the old system - the first 7 pin socket, coloured black is for the road lights, the second, usually white, is for caravan electrics (charging, reverse light etc.)
Just get the adaptor, cheap on amazon, you'll be fine....
Remember when you fit the genuine Volvo trailer module- your car will likely need a software update at the dealer for it to work.
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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