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1. Can anyone advise me on the best place to source ignition parts (OEM quality/best price) i.e. coil, points, condenser etc.?
2. I have 1971 & 1974 140 H3 models. Is there a way to tell if they have a 10 or 15 amp stator without tearing the tractor down?
3. Can one purchase a new wiring harness for these tractors?

Any pro advice would be highly appreciated from you experts and thank you in advance!
 

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isavetractors.com
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i have used the dealer and ebay too for parts

Regulator is different size and the amp meters are different but i forget how to check the stator wires to tell
 

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According to JDParts, a '71 140 should have a 10 amp stator, and a 74 should have the 15 amp stator. Things can be changed in 50 years. You won't know for sure till you take the flywheel off.
Hapco sells new wiring harnesses for these old Deeres.
 

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The 10 and 15 amp stators used a different voltage regulator originally. The plug spacing was different, you could not directly plug one into the other. Now, they seem to use the same part.
 

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Since no one else mentioned it, you can also get the Kirk Engines points saver, stock points and a Bosch blue coil for a little better set-up if you're so inclined.
 
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