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The yellow wire, pin 1, connects to the car's reversing light circuit. Blue and black wires, pins 2 and 7, are not used. The brown wire, pin 5, is used for a warning light supplied with some caravans for dangers such as lowered support legs and handbrakes. To wire the red and green wires, pins 4 and 6, see sideline.

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Fitting a towing socket

A caravan or trailer must, by law, be fitted with certain warning lights. These are wired up to ...