I’m afraid to admit that I have only a slight idea what they do but will go out far enough on the limb of speculation....since the cam WILL (I read in one of these forum posts) operate W/O this cable and considering it is called a “Gumbal” wire/cable. I would deduce that the (isolated) wire on the black connector would be GND and the other wires 3 & 2 operate gimbal YAW & pitch of cam respectively...BUT YHIS HAS NOT BEEN TESTED JUST SOME LOGICAL REASONING.....