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About NOSValves

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    Hale, Michigan

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  1. NOSValves

    My Onan doesn't have spark.......

    What model tractor are you working on? 520?
  2. NOSValves

    My Onan doesn't have spark.......

    You measure the control modules voltage at the positive terminal of the choke. As the flywheel rotates the voltage should go from battery voltage (12 or 13 VDC) to about 1 VDC as you rotate the flywheel. If you search the internet for a service manual for your onan it has instructions for testing the ignition system. But even those instructions are not fool proof. My coil tested fine but ended up being bad. But it had an obvious crack across the top.
  3. NOSValves

    My Onan doesn't have spark.......

    I fixed it inspite you helpful folks around here....it was the coil in spite of it testing as it should...
  4. NOSValves

    My Onan doesn't have spark.......

    Hey folks hope you can help. I'm pulling my hair out. I have a D160 that was retrofitted with a P220 previous to me purchasing it. I used it all this spring and summer but left it unused this fall for 6 to 8 weeks until the other day. It always started right up in the past. This time I couldn't get it to start it tried a couple times but then it would just roll over and over. I pulled the plugs and they were wet and full of soot. I cleaned them up and tried again with no luck. So I dug around and found all the service manual for trouble shooting the P220 Onan. The coil has the appropriate resistance of around 3 ohm primary from + to - and 19K ohms between the secondaries. The control module goes from battery voltage to about 1 volt once per full revolution. I replaced the plugs with brand new and still no spark. I also hot wired the + side of coil from the battery with no change. I'm out of ideas.and the winter snows are approaching fast..