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JohnF2015, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1102
Experience:  Owner/Service Technician at S & J Small Engines
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09 jd x300 lawn tractor no spark coils are good seat and

Customer Question

09 jd x300 lawn tractor no spark coils are good seat and brake switch are good do have spark when the kill wire on the coils are removed and does run any way to test pto switch? Or could it be just a bad circuit in the control module?
Submitted: 1 year ago.
Category: Small Engine
Expert:  JohnF2015 replied 1 year ago.

Hi, my name is***** will be assisting you.

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.

Customer: replied 1 year ago.
Well there is no continuity from m to g in the run position but there is in the off position
Expert:  JohnF2015 replied 1 year ago.

Okay, so the ignition switch test good if that is the case.

Expert:  JohnF2015 replied 1 year ago.

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?

Customer: replied 1 year ago.
Yea i did that first i know a common spot is the seat switch where it drops down through the body but no bare spots and good continuity throughout
Customer: replied 1 year ago.
On the plug for the ignition switch terminals m and g are not used
Expert:  JohnF2015 replied 1 year ago.

Are you certain that 'M' is not being used?

Customer: replied 1 year ago.
both are empty on the plug side but all others are full ill see if i can upload a photo for you
Expert:  JohnF2015 replied 1 year ago.

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.

Customer: replied 1 year ago.
Was the control module like i suspected just wanted to get a second opinion hate just throwin money at random parts. Thanks.
Expert:  JohnF2015 replied 1 year ago.

Thank you it has been a pleasure to assist you.

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