Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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When you have the ground wire removed from the coils does the engine seem to run okay?
There is no way to test the PTO switch without just replacing it to see if that solves the problem. You could have a problem with the ignition switch as well, it may be messed up internally causing it to kill the spark when it shouldn't be. You can test or check the ignition switch by looking at the back of the switch and locating the 'M' and 'G' terminals and testing those when the key is in the run position to see if you have continuity between them.
Okay, so the ignition switch test good if that is the case.
Have you checked all the wiring to make sure that there is not just a bare spot in the wire that may be grounding or shorting out causing it to not fire?
Are you certain that 'M' is not being used?
I have been looking at wiring schematics and the only other thing that I can point out would be the control module. If it were the pto switch the engine would not even crank over.
Thank you it has been a pleasure to assist you.
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