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Avoid the goofy "one-wire" alternators, and get a 10SI DELCO, such as for a mid-70's Chevy pickup. Some guys are using small Japanese alternators that connect the same way the Delco 10SI does. The one-wire alternators need SPEED to excite at startup, so often, that means "goosing" the engine at startup to get them to charge, AND they tend to be prone to slowly discharging the battery during periods of non-use. It is REALLY simple to connect up a standard "3-wire" Delco alternator (or Japanese equivalent), and, likely the standard alternator will cost LESS. I have coverted MANY old tractors with used alternators from auto recyling yards, bought for as little as $10.00, and still working YEARS later. Here's what a Delco 10SI looks like: 
The diode shown prevents the alternator from backfeeding current into the ignition system (battery ignition... coil and distributor), causing the engine to run on when the ignition is shut off. If you want, a dash-mounted "idiot light" is a direct swap for the diode. BobM, over on the Farmall Board, has graciously made available a set up diagrams for various IH tractors, or you can find one close enough to use on about any other brand, as these old machines are typically set up in a very similar fashion. Below is a link to his diagrams. He DOES use "idiot lights" in place of the diode shown in my photo, but as I said, you can use whichever YOU prefer... they function equally well. Post back with any questions!
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