I have got 1993 318 Touring with MALFUNCTIONING 3rd brake light.
I checked the bulbs by connecting them directly to battery > working.
I checked the fuses (#6) > working.
I checked whether electricity is reaching the third brake light > electricity tester not showing any signs of electric input.
Any ideas where I should look at now?
Both rear brake lights are working, so it is not a brake light switch under the pedal.

