There's definitely some weirdness happening here. The yellow/black wire is, without a doubt, the low beam 12V+ feed to the headlight (all 986 models, every country).
I'm also confused by your grey/black wire inside the headlight. With the 100+ headlights I've worked on, I've never seen a grey/black wire inside the headlight. On every set I've worked on, the low beam + is yellow, high beam + is white/red, and parking light + is solid grey. Can you post a picture of the wiring inside the headlight? Where are you getting your main 12V+ (red controller wire input) and ground from?
Can you post a link to the controller you're using?
The top right pin you are referring to is the parking light positive voltage, so it will have power when the headlights are in. The bottom right pin is the low beam positive power and should be getting voltage with the low beams on (it's what the yellow black wire feeds to).
Here is the pinout for the headlight connector (reverse left/right for car side, of course).
Threaded Mode
