Small Engines (Lawn Mowers, etc.): NO Spark, john deere 170, secondary windings

Question
My John Deere has a Kawasaki FC420V with Electronic Spark Ignition.
How does the ignition coil get its 12 volts? Do you think the white wire is the all shut-off lead? It goes tests to ground. I will double check the distance.
Thanks Again

Nick Dell

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Followup To
Question -
I have a John Deere 170 that was working one day then not the next.  Did some test and found that i wasn't getting any spark. So got to the ignition coil and remove the white wire <think that was safety kill switch> and still no spark.
Bought a replacement ignition coil and adjusted the distance.  Still no Spark.  What else could it be?  How does the ignition coil get its 12 volts; I see the magnet for timing? What I'm I missing.  I see other line with 12 volts but i don't know where and how to get to them.

Thanks for your Help

Nick
Answer -
You need to determine if this engine has a points ignition or is electronic.  If it is points (and condensor), you will have to replace them.  If it is electronic, all shut-off leads are disconnected and the air gap is set to 0.010", the ignition coil is defective.  Hope this helps.

Answer
Because it has electronic ignition, the only lead coming out of the coil (ignition module) should be a shut-off.  The ignition module gets it's primary voltage from a set of internal windings that are energized by the flywheel passing them to produce voltage that, when the trigger coil sends the signal (makes or breaks the circuit),  induces voltage to the secondary windings to produce the spark voltage...it's all self contained.  You may have a certain resistance reading to ground on the shut-off lead but this doesn't indicate the coil's condition.  Hope this helps.