• Does either servo twitch by itself?
    If you plug the aileron y cable into channel 4 will it still twitch?
    Have you tried 2 different servos on that y cable?
    Have you tried a different y cable?
    • If each servo is independently connected to the APM then they work fine.  It is only when using the Y-harness and it is just one rudder.  I have tried another y-harness with no luck, as well I have tried another receiver.

      • Try the same servos and harness on another channel. Try the aileron channel.
        • Tried that, but same situation.

          • So we know it's the servos and not the APM.
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