Small Engines (Lawn Mowers, etc.)/No spark


I have a craftsman rider 15.5 model 917.259556 . I have no fire to the plugs but when I disconnect the shut off wire coming from the ing switch going to the coil I have spark. Replace wire and shut off switch still the same. There are two relays that the blue wires from the  safety switches  are connected

Safety switch problem most likely.  The schematic I found online is not very helpful with color coding the wires.

I did not see any relays, only switches.  Trace each wire to each safety swith and make sure they are plugged in well.  Unplugging and re-plugging them in may fix the problem.

Do you have an ohm meter or digital multimeter to test the switches?


Small Engines (Lawn Mowers, etc.)

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Eric A. Jones


Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.


Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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