Here's my post over on the Deere Forum, as usual Professor Jim and I agree, either cuz "great minds think alike" orrrrrrrrr "the blind leading the blind" lol take your pick:
As you already know, that engine is fairly low RPM so the alternator may not ever self excite????? which YES a smaller alternator pulley (which a shop could provide) might cure but the belt has to be good and has to be tight. Ive seen some so called one wire alternators that are nothing more then a 3 wire with a resistor built into the plug that goes over the 2 small side terminals. If that's the case it would be easy to convert it to a 3 wire and provide excitation voltage yourself to get her charging. But that alternator wasn't cheap I bet so before getting another one Id first see if you can put a smaller pulley on it but if not then see if its a 3 wire in disguise. Sounds like its wired right if there's battery voltage on it when she's not running, all it takes is its output terminal wired to the battery via an ammeter if so equipped and of course the case frame well grounded. Id be interested in what Bob has to say???????????
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