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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 15276
Experience:  Certified on Onan and Generac generators
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MY ONAN GENERATOR IN RV won't start 4000kw out put 4

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MY ONAN GENERATOR IN RV won't start 4000kw out put 4 KYFA261000model. sparks only when releasing starting switch.?
JA: What confuses you?
Customer: why it doesn't spark when trying to start generator? unit won't run at all
JA: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?
Customer: all in fuel is well. ignition coil seems to be problem
JA: Do you plan on doing the work yourself?
Customer: i'm a millwright for 50 yrs yes I can figure out mechanical problems NO spark is problem
JA: Anything else we should know to help you best?
Customer: ignition coil is a(###) ###-####numbers on coil made in germany from Purfex I think

Hello, my name is ***** ***** I am going to assist you with this.

No spark until you let off the start switch is normally a sign of a bad magneto, but can be a bad coil.

Remove the control panel to access the coil
Pull the white wire off the coil.
Pull the spark plug wire off the spark plug.
Set your meter to ohms.
Connect the black lead to the coil mounting screw.
Connect the red lead to the terminal you removed the white wire from.
You should get a reading of 0.5 ohms.
Now connect the red lead to the spark plug wire.
You should get a reading of 1,100 ohms.

If either reading are out, the coil is bad.

Now set your meter to ACV.
Connect the black lead to a good engine ground.
Connect the red lead to the white wire you removed from the coil.
Press and hold the start button for about 5 seconds.
You should get a reading of 15-60 VAC.

If you do not get a minimum of 15VAC, the magneto is bad.

Customer: replied 1 month ago.
the omh reading went right to the end of scale on both terminals
Customer: replied 1 month ago.
Thks for the input. do you have Cda address where I might order one

You can get one here:

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