Rear right hand side light

[plumber_dazz]

Hi all, hoping someone can shed some light on my current situation.

05 ford transit connect 1.8 lwb

MOT coming up and was doing a few checks on bulbs etc. Had to replace the rear side light.
Changed the bulb but still didn't solve the problem, fuses are okay

Checked supply to left side side light and getting a 12v supply there, but to the right side Im not getting anything.

There is a short or something? Break in the cable?
Anyone have a diagram of it or a wiring diagram in general.
Need to know if I will have to strip out the back of the van or if there is an easier place to look first?

Many thanks all.