Hy guys the instructions say left tail light to multi yellow black wire. So far so good. Right tail light to yellow/red. The problem is there is no yellow/red. There is a red yellow which I used for the brake.
Any help would be greatfully recieved

cant tell you which wire does what but if you have a multimeter just check for wth wire with 12 vots on it when you turn on the desired light.

if you dont have a meter just use a bulb from the rear light and a couple of bits of wire - connect 1 wire to earth then to the earth on the bulb and the other wire between the connection you think is the supply and the live terminal of the bulb. if it lights up when you turn on the required switch then youve found the wire - hope that made sense

Okay eventually found my tester and this is how it goes. I'll just state on thing. This is for my diesel jtd W reg multi.
(Left side)
blue/black=indicator.
black=earth
red/yellow=brake
yellow/black=night light
white=on the right this colour is fog (no fog light on the left)

The right mirrors the left.
(Right side)
blue=indicator
black=earth
red/black=brake
yellow/red=night light
white red=fog