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Autotrac JD 6430

I have just installed a JD autotrac kit in a 6430.  I am getting ssu error 523810.01 which is low voltage to the steering valve.  Actually the voltage is zero.  This prevents me from calibrating the autotrac.  Does anyone know what causes no voltage to the steering valve?  I believe the voltage come directly from the ssu, so it could be defective or the wiring harness could be defective.  Help!

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