GSK980MDi-H and GR2000 User:
If you see the photo, those come from the spindle' s drive and the cord named GR2000Y; we don´t know where the blue connectors fit (or, at least, do not find anything that matches with the labels on it).

We assume the cord-side connector named GR2000Y  fits in the CN3 connector spindle´s  drive just because it´s the only one with this port matching the cord´s type.

Would you help with this issue.?   



CNCmakers support:
It is for external spindle encoder, if you have one.