Wiring code for 12N and 12S and Foreign 13 Pin sockets

12N Wiring Code

Pin Number	Colour	Function
1	Yellow	Left indicator
2	Blue	Fog lights
3	White	Earth
4	Green	Right indicator
5	Brown	Side light
6	Red	Brake lights
7	Black	Side light

The indicator circuits must have a warning light or sounder so that the driver knows when the indicators on the trailer are working.

12S Wiring Code, pre 1999 to British standard

Pin Number	Colour	Function
1	Yellow	Reversing light
2	Blue	Battery Charging Via relay in car
3	White	Common Return
4	Green	Power feed for internal 12v equipment (not fridge)
5	Brown	Spare
6	Red	Refrigerator (via relay in car)
7	Black	Spare

The auxiliary battery charger and refrigerator must be fed via a
relay to prevent the vehicle battery from being discharged.

12S Wiring Code, post 1999 to European standard

Pin Number	Colour	Function
1	Yellow	Reversing light
2	Blue	Spare but maybe connected to Pin 3 in the caravans plug (as a signal to car that caravan is connected) if car is wired for this(unaware of any cars currently wired this way) potential short circuit if car is wired as per old system and caravan as new system
3	White	Return for circuits connected to Pin 4
4	Green	Power feed for internal 12v equipment or to charge caravan battery via a relay in the caravan (not fridge)
5	Brown	Spare
6	Red	Refrigerator (via relay in car)
7	Black	Return for circuit connected to Pin 6

Important. The earth returns must not be connected together each must be run separately back to the car body earth, (except Pins 2&3).

The 12s socket must be wired in a minimum of 2.5mm² cable, throughout the cables length.

Foreign 13 Pin

Pin Number	Colour	Function
1	Yellow	Left hand indicator
2	Blue	Rear fog light
3	White	Common return for Pins 1,2 and 4-8
4	Green	Right hand indicator
5	Brown	Right hand rear position and end outside light and rear registration plate
6	Red	Stop lights
7	Black	Left hand rear position and end outline light and rear registration plate
8	Orange	Reversing light
9	Brown/Blue	Continuous power supply
10	Brown/Red	Power supply controlled by ignition
11	White/Blue	Common return for Pins 10
12		Spare
13	White/Green	Common return for Pin 9

Please Note: These wiring codes have been prepared with the greatest care and as far a we are aware they are correct however Caravanninglinks or Powerlink House ltd and it's representatives cannot be held responsible for incidents arising from using these wiring codes. If you are unsure about anything please contact an approved caravan service centre.

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