EU zenki turn signal problem/question

[Spitfire]

Hey people,

another day another problem I was mounting on my zenki front bumper today (had a kouki one on but the turn signals light bulb cases are so rusty that it simply wont let any electricity through, I cant even pull them out. But thats not the problem). After everything was done, I tried the turn signals but the left one doesnt work (it worked last time I checked - 3 weeks ago). The bulbs are new and shine perfectly, I swiched the left to right and vice versa and yet again, only the right works.

Logicaly, there must be a wiring problem. I checked the cables and they seem to be ok (as I said it worked great 3 weeks ago), so I have no idea where to start. One thing though concerns me, I tried to unmount the front left quaterpanel turnsignals (they didnt work since I got the car) to check if the problem is with the bulb but I didnt manage to get it, it sortof "fell" inside the quaterpanel, though the wiring stayed intact.

I would like to ask if the front and side turn signals work in one closed electrical cicle, which would mean that damaging the side signals will cause the front ones not to work. This will give me an idea where to start I tried to remove the quaterpanel to check but had no luck at all, the thing seems to be glued or something...

Thanks a lot people


EDIT:
Thanks boys for the Tech FAQ page, I managed to find the electrical wiring diagrams But I dont understand sh*t anyway.... Heres the wiring of turn signals, as far as I understand it seems that the front turn signals should work even when the side signals wont... In that case, where could the problem be?