amir seeing as the output is AC, your assumption would seem to be incorrect about current flow.
now i say current flow in positive direction from one cable and flow in negative direction from another cable
Im still unsure, as it will alternate between cables, how does it show your cable to be at fault? Surely it could of been either. Im not saying you are wrong in wanting to change cables, just that i think your experiment would not prove it.
in electromagnetic when two cables are beside them we have one capasitance between them and if these cables be far from each this capasitance reduce