Home Nice to Know Towbar Wiring Codes and Colours
Towbar Wiring Codes and Colours PDF Print E-mail

 

 

Fitting a Towbar ?

Then Know your Towbar Wiring Codes and Colours

 

12N Wiring Code

Pin Number

What Colour it is What it is used for
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

What Colour it is What it is used for
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

What Colour it is What it is used for
1 Yellow

Reversing light

2 Blue

Spare but may be 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

What Colour it is What it is used for
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



 
 

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