Door mounted brake light u\s

Rear door mounted brake light not working. Both quarter brake lights ok. Looking at the brake pedal it has two switches mounted above the pedal, the right one does the wing lights, does the left do the rear door brake light or is it ABS or similar. Normal stuff checked, bulb, earth etc, any ideas most welcome . Thanks team. Sorry 2007 110 puma.

After another stint with the tester im puzzled even more.
Both switches at the pedal test ok.
Power to the rear door terminal at the bottom right corner of the door glass has power that comes on \ off with the pedal as it should.
If I put the bulb holder from this terminal to earth the bulb lights as it should.
I have continuity from the terminal at the glass to the terminal next to the light and 13v but if I try the same trick with the bulb holder to earth I get nothing!
I have continuity on the other terminal from the light to earth as you would expect,
What am I missing please?

Old man river said:

After another stint with the tester im puzzled even more.
Both switches at the pedal test ok.
Power to the rear door terminal at the bottom right corner of the door glass has power that comes on \ off with the pedal as it should.
If I put the bulb holder from this terminal to earth the bulb lights as it should.
I have continuity from the terminal at the glass to the terminal next to the light and 13v but if I try the same trick with the bulb holder to earth I get nothing!
I have continuity on the other terminal from the light to earth as you would expect,
What am I missing please?

Click to expand...

With the car turned off, set the meter to ohms and measure the tracks through the glass. Go from the one at the bottom to the one at the top. Let me know what the reading is.

Hi, will do that tomorrow and let you know,