When I wired up the electrics for my V40 2.0 SE 2002 I simply spliced into the appropriate wire on the rear loom running across the back of the car. If you have a multimeter or just a 12v test light you can identify the right wire by probing into the loom while operating the rear light. To be legal and pass an MOT you should have a beeber buzzer sounding when you operate the indicators while your caravan/trailer lights are plugged into the car socket.
Halfords use to sell the buzzers some years ago not ureif they still do.
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