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John Deere 140 No spark

8506 Views 34 Replies 8 Participants Last post by  lisle
Ive got an early i believe John Deere 140. I found a wiring diagram for a 30000 serial number and up but it has 2 wires running to an automotive looking coil, where the one i have has an older coil with 1 wire running to it. I would go get the serial number but its late and its out in the shop...

Ive got no power to the coil when i turn the key on, but when i crank the engine i do get power pulsing to that wire. Would that suggest a bad coil? or should the coil have more constant power.
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First, welcome to WFM, Matt!
Since I have no idea what the old Kohler Solid State Ignition or magneto ignition looks like, I should probably not be posting. However, if it's possible that the one wire coil is something of that nature, and it saves Matt from more problems, I don't mind showing my ignorance.

Having only one wire on a coil and getting some pulsing voltage is difficult to understand from a conventional old style automotive coil. Perhaps you can give us more info such as the serial number on the tractor or the spec. number on the engine. Is it a 12HP (K301) or 14HP (K321) engine? Does the engine have breaker points?
Could you post any pictures or e-mail them to Roger, me, or another member to post for you. Might be something interesting to see.
JD Parts is not available for me at the moment. Maybe I can take a look later.

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