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FWIW, I have a 424 diesel AND I've converted a LOT of old tractors to 12 Volt alternators, but my 424 generator has always worked, so I haven't changed it over to an alternator (yet). What you would need to do is get an alternator, such as a 10SI Delco. With that alternator, you would remove the original voltage regulator. Take the wire that was on the "BATT" terminal on the old regulator, and connect it securely to the wire that was on the "ARM" (or "GEN"} terminal of the old regulator. Along with the heavy-gauge wire that WAS on the regulator's "ARM" (or "GEN") terminal, there should be a lighter-gauge wire. This is connected to the dash-mounted "idiot light". This wire needs to be separated from the heavy-gauge wire, and extended to reach the alternator's #1 (switched excite) terminal. The alternator's #2 terminal gets jumpered over to the large output stud. The large wire that used to connect to the generator's "A" (ARM) terminal gets connected to the alternator's large output stud, too. That completes the wiring. The alternator should work just as the generator did, and even the "idiot light" will work as it originally did with the generator. You'll have to do some fab work with the brackets, and likely you'll want a smaller pulley on the alternator that was used on the generator. Any other questions, post back, and I'll take a look at my 424 when I'm at the farm tomorrow, and post back.
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