Re: Onan no spark while cranking but fires when ke

Posted by Tom in TN on April 09, 2004 at 08:04:22 from (64.12.116.80):

In Reply to: Onan no spark while cranking but fires when key is posted by Steve on April 09, 2004 at 05:25:53:

Steve,

I think that Ron in AR is on to something. I don't know about your Onan engine, but commonly, there will be a resistor in the primary coil circuit. If that resistor exists, there is usually a wire from the "Start" connector on the ignition switch or from a small connector on the starter solenoid etc., that provides the full battery voltage to the coil during starting (bypassing the resistor) but then goes away when the ignition switch is released to the "On" position. With the switch in the "On" position, the battery voltage is applied to the resistor which reduces the voltage that is subsequently applied across the coil.

So, if battery voltage is not getting to the coil when the ignition switch is in the "Start" position, the engine won't have any spark while cranking, but when the ignition switch is released to the "On" position, it will have spark and might start.

You might want to ascertain whether or not you have an external resistor, and then how that resistor is bypassed during starting. I think you might have a problem in that bypass.

Good luck,

Tom in TN

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