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420 JD clutch won't engage

Roger I have a JD 420 lawn tractor pto clutch,it will not engage.Tried new pto switch and ignition switch,no differance.
But if I run a 12 volt jumper wire direct to the clutch it engages fine.Any info?

johnrrrrrrrrrrrrrrrr been there done that, got the t-shirt, check the safety switch under the seat, Jumper it out to check. Do not operate in this condition unsafe.
Roger There seems to be a clicking sound coming from a black box inside,does anyone know what this part does?
johnrrrrrrrrrrrrrrrr Had the same sound with my problem,something to do with cutting the pto off if a safety switch is open.

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