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jd 425 no spark at either plug

earney my jd 425 will not start because no fire to either plug is there a circuit board or rectifer that is bad or where should i start looking
thank you

samuel i and have the same problem BY passesd seat switch and brake switch.still no spark.
samuel i checked and cleaned and tested all 3 safety switches.pressure sensitive seat switch,brake switch.and pto switch.PTO switch intermittent.Replaced.......sucess.
shawn sounds to me that the problem is the time delay module box which is located at the left rear side of the engine

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