Rear demister and High level brake light

[fossie]

For some reason neither of the above are working..
The button for the rear demister illuminates when pressed but doesnt demist..........
Dont have a clue about the brake light.

Any suggestions on what to check would be great..

 

[elmo2002]

i would check where the wires go into the tailgate to be honest.

 

[fossie]

Ive already pulled the rubber gromits off and they are both connected on each side, is there an earth somewhere in the boot i can check, possibly the same earth as the high level brake light??