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This is a follow-up to the problem I originally posted on May 2. Reference the original thread to read the full details. Here is the final entry...
**THE FIX**
If you read through all of the entries of this thread, you'll find the steps I used to diagnose this problem. I am writing back here now to tell you all my fix to the "dead" left cylinder.
I had ruled out the plugs, because they were new and I had checked the gaps. I swapped the coils from side to side, and the problem stayed on the left cylinder. I checked the voltage coming from the left pulser coil, and it was ok (.05-.20 VAC). I checked the ground wire to the igniter (ignition module), and it was good continuity. The service manual had me look at a couple other voltage readings, and they were also ok. Per the John Deere service manual, I changed the igniter, and it is now fixed.
*Note* This tractor is powered by a Kawasaki twin, so realize that there will be options to getting parts, not just through "JD". I saved OVER $100 by NOT buying through "JD". It is a Nippon Denso ignition part, so many machines may use it besides John Deere & Kawasaki. (Denso 21119-2120 now superseded by Denso 21119-2157).
Thank you all for your help, and good luck to you all with your troubles. Feel free to contact me with a question on any 400 series (425, 445 or 455) tractors. I'd be glad to try to help.