Hi all
My tail lights are out

I have checked the fuse and it is fine
I have checked and there is a 12 v supply at the fuse.
However I have also checked at the back of the car and needless to say there is zero volts.
Is there a known fault / break here?
Any thoughts?
Can anyone tell me the route of the cable as there is no "Haynes" manual in the UK
Thanks
John