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Garden Tractors Discussion Forum

ignition on John Deere 112

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LinemanFarmer

07-26-2007 05:23:38




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I have been working on this 112 for some time, I finally found a Kohler engine to put in place of my techumse. Well as it goes swaping out different engines, nothing matches, I had to notch the fram and different things just the get the Kohler in there. Well now the wiring comes along and for some reason I just can't get it right. I has a coil that is decently new, and says it a hi energy coil. Well there are two wires that hook up to the coil, one the negitive side comes from the points and condenser the other from behing the flywheel, and it im pretty sure goes the the ignition switch. Every thing was the same on the other mower and it ran. When cranking the engine, watching the spark plug, will not spark when turn fast or I have my have it cranking it over, I let off it slows down and it will spark. Also, when I was trouble shooting, that coil was getting plenty warm, and when I would pull the positive wire off, and would make a good arc, I have never seen one do that, I could make it arc 3/16". So I hooked the positive wire of the coil to the battery and I ran, so I took that wire directly to the ignition switch so I could shut it off with out pulling the wire off, and It wouldn't work again. The only thing that I can think, is my ignition switch has a high resistant connection????? That is the only thing between the battery connection and the coil right now and it will only spark when turning over slow. See what you guys think....

Thanks, Derek

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joe csuti

07-26-2007 13:41:39




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 Re: ignition on John Deere 112 in reply to LinemanFarmer, 07-26-2007 05:23:38  
Your problem is you are not feeding ign coil +12v when cranking eng,when you release key & goto run position coil being fed +12v from ign sw(this is why you have spark when eng slowing down),what you have to do is goto an auto parts store & see if you can find a 12v ford starter sol from the 50's - 60',these had an aux contact in them to feed power to ign coil while cranking eng,or add a N/O pusbutton to dash & push when cranking eng,or goto radio shack & get a small cube relay and wire into ign sw to supply ign coil in start & run position,I've run into same problem many times,converting kohler solid state ign back to point type with conversion kit,Tecumseh eng used a ground kill ign system thru an isolated aux contact on ign sw.

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El Toro

07-26-2007 10:51:54




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 Re: ignition on John Deere 112 in reply to LinemanFarmer, 07-26-2007 05:23:38  
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If you are using an automotive type coil with a 12 volt battery using a negative ground. Your wire from the ignition switch to the coil should be connected to + terminal on the coil and from the neg terminal off the coil to the points. Battery voltage should be fed to your ignition switch and it feed battery voltage to the coil when in the run/start mode. Here's the only sketch I have on Kohler with points. Hal

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