ORIGINAL: bubbagates
I would take the servo and plug it directly into the receiver using no extensions. If it still fails that way then you have a bad servo. Depending on your radio I would use separate channels for each aileron, the benefits far outweigh using a Y cable but again your radio must support this and most 2.4GHz radios do.
I have the Futaba 7C 2.4....I am allready using ch 2 and 5 for elevators...and ch 6 for kill switch. no room....
TY i will take everything apart again....