Thanks for the picture, i've seen those nosram esc by dooing some google serch, but this does have some kind of an relay on it, mine doesnt?
Still not found a matching piece, but serch goes on.....
Edit: I've made a close up picture from the board, it looks like quit a bit more modern, with ist Chips and LED's on it, may ist not that vintage than i thought, what do you think?
I'm not that much into electrics, so may could be wrong as well!?
