12N, 12S, 24N, 24S, 13-Pin and 15-Pin Connector Terminal Guide
4 December 2016
This wiring guide at Arc Components Limited presents standard-style caravan and trailer towing connectors configured in their historical terminal functions.
The earlier connectors, 12N (12Vdc, Normal ISO1724), were designed for essential lighting supply from the car or van to the towed equipment and was joined later by the 12S (12Vdc, Supplementary ISO3732) connector for extended lighting and additional auxiliary functions. The 24 Volts DC versions 24N (24V, Normal ISO1185) and 24S (24Vdc, Supplementary ISO3731) were configured for the larger HGVs and trailer connection. The 12N/24N connectors are used for vehicle lighting extensions, and the 12S/24S connectors are used for extended lighting and auxiliary power connectivity.
They are joined in the extensive range of motor vehicle power products by the updated 13-Pin (Thirteen Pole to DIN72570, ISO11446) and 15-Pin ( Fifteen Pole to ISO12098) plug and socket connectors.
12N Plug Wiring Code - ISO 1724
Pin
Terminal Type
Function
Cable Colour
1
Pin
Left-hand Flasher Lamp(s)
Yellow
2
Socket
Rear Fog Lamp(s)
Blue
3
Pin
Common Return
White
4
Pin
Right-hand Flasher Lamps
Green
5
Socket
Right-hand Side and Tail Lamp(s)
Brown
6
Pin
Stop Lamps
Red
7
Socket
Left-hand side, Tail and Number Plate
Black
12N Socket Wiring Code - ISO 1724
Pin
Terminal Type
Function
Cable Colour
1
Socket
Left-hand Flasher Lamp(s)
Yellow
2
Pin
Rear Fog Lamp(s)
Blue
3
Socket
Common Return
White
4
Socket
Right-hand Flasher Lamps
Green
5
Pin
Right-hand Side and Tail Lamp(s)
Brown
6
Socket
Stop Lamps
Red
7
Pin
Left-hand side, Tail and Number Plate
Black
12S Plug Wiring Code - ISO 3732
Pin
Terminal Type
Function
Cable Colour
1
Pin
Reverse Lamp
Yellow
2
Socket
No Allocation
------
3
Pin
Common Return, Ground for Pin 4
White
4
Pin
Power Supply
Green
5
Socket
No Allocation
Brown
6
Pin
Ignition Controlled Power Supply
Red
7
Pin
Common Return, Ground for Pin 6
Black
12S Socket Wiring Code - ISO 3732
Pin
Terminal Type
Function
Cable Colour
1
Socket
Reverse Lamp
Yellow
2
Pin
No Allocation
------
3
Socket
Common Return, Ground for Pin 4
White
4
Socket
Power Supply
Green
5
Pin
No Allocation
Brown
6
Socket
Ignition Controlled Power Supply
Red
7
Socket
Common Return, Ground for Pin 6
Black
24N Plug Wiring Code - ISO 1185
Pin
Terminal Type
Function
Cable Colour
1
Pin
Earth
White
2
Pin
Left-hand Side, Tail and Number Plate
Black
3
Pin
Left-hand Indicator
Yellow
4
Pin
Stop Lamps
Red
5
Pin
Right-hand Indicator
Green
6
Pin
Right-Hand Side, Tail and Number Plate
Brown
7
Pin
Trailer Brake Control to ISO 1185
Blue
24N Socket Wiring Code - ISO 1185
Pin
Terminal Type
Function
Cable Colour
1
Socket
Earth
White
2
Socket
Left-hand Side, Tail and Number Plate
Black
3
Socket
Left-hand Indicator
Yellow
4
Socket
Stop Lamps
Red
5
Socket
Right-hand Indicator
Green
6
Socket
Right-Hand Side, Tail and Number Plate
Brown
7
Socket
Trailer Brake Control to ISO 1185
Blue
24S Plug Wiring Code - ISO 3731
Pin
Terminal Type
Function
Cable Colour
1
Socket
Earth/Ground
White
2
Pin
ABS Fault Indication
Black
3
Pin
Reverse Lamps
Yellow
4
Pin
+24V Permanent Live
Red
5
Pin
Control via Earth/Ground
Green
6
Pin
+24V Switched Live via Ignition
Brown
7
Pin
Rear Fog Lamps
Blue
24S Plug Wiring Code - ISO 3731
Pin
Terminal Type
Function
Cable Colour
1
Pin
Earth/Ground
White
2
Socket
ABS Fault Indication
Black
3
Socket
Reverse Lamps
Yellow
4
Socket
+24V Permanent Live
Red
5
Socket
Control via Earth/Ground
Green
6
Socket
+24V Switched Live via Ignition
Brown
7
Socket
Rear Fog Lamps
Blue
13-Pin Plug Wiring Code - (DIN 72570) ISO 11446
Pin
Terminal Type
Function
Cable Colour
1
Pin
Earth/Ground
Yellow
2
Pin
Rear Fog Lamp(s)
Blue
3
Pin
Common Return for pins 1 > 8
White
4
Pin
Right-hand Flasher Lamps
Green
5
Pin
Right-hand Marker, Tail & Right Number Plate Lamp(s)
Brown
6
Pin
Stop Lamps
Red
7
Pin
Left-hand Marker, Tail & Left Number Plate Lamp(s)
Black
8
Pin
Reverse Lamps
Pink
9
Pin
Continuous Power Supply
Orange
10
Pin
Ignition Controlled Power Supply
Grey
11
Pin
Earth Return for Pin 10
White/Black
12
Pin
Trailer Coupling Information
------
13
Pin
Earth Return for Pin 9
White/Red
13-Pin Socket Wiring Code - (DIN 72570) ISO 11446
Pin
Terminal Type
Function
Cable Colour
1
Socket
Earth/Ground
Yellow
2
Socket
Rear Fog Lamp(s)
Blue
3
Socket
Common Return for pins 1 > 8
White
4
Socket
Right-hand Flasher Lamps
Green
5
Socket
Right-hand Marker, Tail & Right Number Plate Lamp(s)
Brown
6
Socket
Stop Lamps
Red
7
Socket
Left-hand Marker, Tail & Left Number Plate Lamp(s)
Black
8
Socket
Reverse Lamps
Pink
9
Socket
Continuous Power Supply
Orange
10
Socket
Ignition Controlled Power Supply
Grey
11
Socket
Earth Return for Pin 10
White/Black
12
Socket
Trailer Coupling Information
------
13
Socket
Earth Return for Pin 9
White/Red
15-Pin Connector Wiring Code - (DIN 72570) ISO 11446
Pin
Function
Cable Colour
Cable Size
1
Indicator Left
Yellow
1.5mm²
2
Indicator Right
Green
1.5mm²
3
Rear Fog Light
Blue
1.5mm²
4
Common Return for 1-3 and 5-12
White
2.5mm²
5
Left Tail, Side and Number Plate Lighting
Black
1.5mm²
6
Right Tail, Side and Number Plate Lighting
Brown
1.5mm²
7
Stop Lights
Red
1.5mm²
8
Reverse Light
Pink
1.5mm²
9
Power Supply (+ 24 Volts)
Orange
2.5mm²
10
Sensor Brake Pad Wear
Grey
1.5mm²
11
Display for Accumulator Brake
White/Black
1.5mm²
12
Axle Lifting
White/Blue
1.5mm²
13
Common Return Data Cable 14-15
White/Red
2.5mm²
14
Data Transmission CAN H
White/Green
1.5mm²
15
Data Transmission CAN L
White/Brown
1.5mm²
