Hi ! I have my own modpack and wanted to power MFFS with EU (version 1.7.10) . Ic2 want connect and i dont know why, can you help me ?

A) IC2 api likely broke again, it tends to drop wire connection logic while still visually connecting. This is even a bug in the 1.12 code for ICBM-Classic and our other mods.
B) 1.7.10 has no developers working on it so even if we do find a fix its unlikely to get applied... sorry