Anything produced in the last 20 years that plugs into a radio, it is the middle wire on the plug that needs to be disconnected, whatever colour scheme the manufacturers used. But leave one on, the radio and servos get their power that way.
The middle recepacle can be winkled out by releasing its locking tab and pulling, then tape it back in a tidy manner. That way, should the need arise, it can be easily refitted for re-use.