Y-Harness Dual Rudder Problem Issue

For some reason when connecting to the APM channel 4 (rudder) using a Y-harness for a dual rudder setup, there is extreme twitching in one rudder.  Has anyone experienced this?  Any suggestions?

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Permalink Reply by iskess on March 23, 2014 at 5:24pm
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?
Permalink Reply by Tim Mulder on March 23, 2014 at 5:48pm

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.

Permalink Reply by iskess on March 23, 2014 at 6:10pm
Try the same servos and harness on another channel. Try the aileron channel.
Permalink Reply by Tim Mulder on March 24, 2014 at 4:10pm

Tried that, but same situation.

Permalink Reply by iskess on March 24, 2014 at 4:42pm
So we know it's the servos and not the APM.

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