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Mornin Preacher, Its Sunday morning, you ought to be preachin now and having a fried chicken dinner later and not workin on any JD lol. Anyway, without knowign the specifications and electrical characteristics and voltage regulation system on your particular alternator, I cant answer the question for certain, but in theory at least, a rotating DC electro magnet (Rotor) can induce energy into the stator, regardless of its direction of rotation. An alternator passes DC current through the rotor to produce a magnetic field, and anytime you pass a magnet past a coil of wire (Stator) it induces voltage therein. The Stator windings produce an alternating current which is thereafter rectified (changed to DC) by the diodes, and then voltage and current regulated by the inernal regulator on those one wire alternators. So, it will induce energy into the stator regadless of rotation direction, but there couild still be some sensitive electronics issues in the voltage regulation system or circuits that I cant address not having the specs in front of me, but since the stator sees AC and the rectifier diodes changes it to DC anyway, and the regulator system is primarily DC, my guess is it will work regardless of direction. HOWEVER, I have spun many automotive alternators and they seemed to make different sounds if rotated backwards, maybe partly due to the slip rings and how they are held down??? Does spinning yours either way produce any difference in feel or sound or funny noises????? ?? If not, I believe it will work regardless of rotational direction, I know in theory it will. As far as cooling, since its designed to run under hotter hoods as opposed to out in the open like on your tractor, I dotn think it will make any noticeable difference regardlss of the direction of air flow. I say put it on and give her a try and if she wont work backwards, I will always say it should have in theory lol and you can drop back and punt. Let me know if it worked or not . God Bless, ol John T
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