I have a 450 ES that was sitting idling and just died. No spark, no voltage at coil. The kill switch has been cycled on and off several times and so had the ignition. All fuses have voltage on both sides. I am thinking module or ignition voltage getting lost but can't find a full wiring diagram that can be expanded to show wire colors. I can find the right half, but the left half is the side with the kill switch and ignition on it. Any ideas that could help?

 

Found wiring diagram. $6.50 at Tech Master Manuals. Voltage and grounds are checking out. I have 1.7 V ac coming from ignition pulse generator but I also have 1.7 V coming from yellow wire from alternator and thinking maybe that is what is keeping module from working. Thinking maybe bad regulator or alternator. Any ideas to nail it down.

 

The regulator on the 450 can kill the spark if it goes wrong. Disconnect the regulator and check if you are getting a spark at the plug.

 

I checked voltage while cranking on wheeler and had 1.7 v on yellow wires coming from regulator to alternator that also feed over to ignition module. Found wheeler with same regulator and changed, same voltage with it too. Tried ignition module and it started right up and then the regulator went to 6 volts on the three yellow wires. So ordered new ignition module and all is well. Thanks for all the help guys!