Headlight issues

[Ivan141]

Is your wiring tampered with or original? Those wire colors you mention are unusual indeed.

Maybe you are misunderstanding the dimmer and light switch functionality. AFAIK, both german and european models use the same switches. The light switch only switches between off, tail and head.
The dimmer switch on the steering column has 3 positions IIRC:
mid = high beam OFF.
away from driver = high beam ON
pull toward driver = flash.

EU models have power to the headlights switched on the moment you turn the switch to the HEAD position (fully on) OR when you pull the column lever to FLASH.

What type of wiring do you have? German type with 4 fuses, dimmer relay and switched 12v signal to the bulbs, or EU spec with 2 fuses and switched ground through the light switch. Should be relatively easy to figure out.