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btcruzer's avatar
btcruzer
Explorer
Mar 28, 2016

another ONAN question.

an Onan microquiet 4kw. won't start. Checked all the obvious- fuel, fuel pump, and carb. The problem is " no spark" at the plug when cranking. I talked to Flight Systems who supplied the new control module we'd installed last summer. They say that the engine should produce spark while cranking even with the control module unplugged. The control module puts out a ground on pin 11 to kill the ignition when the stop button is pushed. There is no spark at the plug while cranking either with the module unplugged or plugged in.
This Onan has a very small ignition module at the end of the sparkplug wire. Only one small low tension wire 'feeds' it. My question is "where does this wire go to?". A magnito/points setup under the flywheel? What kind of voltage should I find on this wire? I guess I'd like to know whether the ignition module is bad or if something is amiss in the magnito area. I've looked for replacement points online just to determine if this thing even uses points, never found any points listed for Onan.
  • j-d's avatar
    j-d
    Explorer II
    I found this coil on a parts site and your spec is in fact different from ours.



    Very clearly NOT at the end of the spark plug cable, and he site specifies that we need to buy the plug terminal and boot separately in order to use this coil.
  • any help will be appreciated. I didn't think I could have missed the spec #. Just checked again -- no spec # on the label.. pretty old unit, probably around 1999 or 2000.
  • j-d's avatar
    j-d
    Explorer II
    It should be "F" the last character in the Model Number. Ours is "K" and there's "K" at the end of Model Number AND a separate "Spec: K" on the label.

    I'm far from best equipped to help with this, but we have a couple ONAN gurus who still visit here. Meanwhile I'll look to see if I have a parts list then if F is set up same as K
  • the model # is 4kyfa26100f
    you'll have to give me a clue as to where the "spec" code is.
  • j-d's avatar
    j-d
    Explorer II
    Please reply with the full Model Number and Spec Code.

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