Rear Number plate lights not working

[veedubmk2golf]

Hi every 1, I seem to have a problem with my rear number plate lights as I've taken both lenses off and both bulbs are OK and there is no sign of corrosion and the fuse is OK.

could it me the actual light unit which is faulty and its strange because I've not been near them to disturb any of the wires

Could any1 help me or point me in the right direction to solve the problem, thanks 

[mattneck(Beavis)]

bang on the tailgate, on the plastic trim above.. honestly, it worked for mine 

[J.stafford16v]

bang on the tailgate, on the plastic trim above.. honestly, it worked for mine 

Works on my Volvo aswell!!!

[Dub-77]

Broken wire at the top of the tailgate where they go from Body to tailgate inside the black boot.

Darren