I no longer have any eng with solid state ign,maybe one of the other guys knows/can help as to what approx voltge is to trigger module when CRANKING eng,the 14V you're talking about from stator is when eng running,the alt output voltage is dependent on eng speed,if you have a weak/tired battery,wiring on tractor in poor condition,starter motor that's getting tired or summer wt oil in eng below 40 deg all will affect cranking speed/voltage output from alt stator.
If you have been reading/following replies and as stated in replies if you haven't done so already,disconnect ign kill lead at BOTH ends & check between either end of wire & chassis/eng with an ohmmeter to confirm kill lead not grounded,then disconnect AC stator output from rectifer/regulator & crank eng/check for spark,shorted diodes in regulator will cause loss of or low AC voltage in alt stator if diodes bad.
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