13pin Socket & Plug wiring
Terminal Number	Function	13 Core wire colour	13 Core wire colour
1	Indicator LEFT	Yellow	Yellow
2	Rear fog light	Blue	Blue
3	Earth for contacts 1 to 8	White	White
4	Indicator RIGHT	Green	Green
5	Side lights, marker lights & number plate light RIGHT	Brown	Brown
6	Brake lights	Red	Red
7	Side lights, marker lights & number plate light LEFT	Black	Black
8	Reversing lights	Pink	Pink
9	Positive direct from battery	Orange	Purple
10	Positive ignition key on	Grey	Grey
11	Earth return for contact 10	White/Black	Clear
12	Signalling connection to trailer	White/Blue	Buff
13	Earth return for contact 9	White/Red	Black/Red