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I am not a Ford engine expert, but the problem you are describing

sounds like one that you would experience if there is a problem with the safety switch under the seat

that is grounding the coil out

the problem can be with a loose wire or if the wire to the switch is frayed and touching the frame anywhere alone the wire where the insulation is not present

if the safety switch is not getting pressed down all the way this would also happen

as if the switch had come out of its mount some how or a bracket or mount had been bent

Sometimes the switches go bad to the point where they must be pressed too hard to engage and a person is just not heavy enough to press the switch

kind of like when a child sits in the fron seat of a car with an air bag sensor

except

if the switch is not working, there will be no spark because the coil is grounded out

having said this, I do not know if the 345 has a safety switch under the seat, but it sounded too familiar not to comment on

I will opt out in case another expert has a totally different answer that will explain your problem