24-12v conversions have always confused me, because none of the "correct" or "common" solutions offer what I need. I like the idea of the dual alternators, because it gives 2400 watts to play with before dipping into the batteries, which is good for a LOT of usage- 20 amps at 120VAC (although losses in an inverter would make it less than that- you get the idea), which is fairly substantial.
Converting to 12v with a single alternator would result in halving the output. Still pretty substantial at 1200 watts, but I'd rather have more than less.
So, in theory I'd say that one could just run the alternators and batteries in parallel rather than series (just ground them both to chassis ground rather than to each other) and then you'd have a 12v/200A system. Granted, one of the alternators' voltage regulators is going to cause it to kick in slightly before the other, so most of the time one will just be freewheeling, but when you put it under load, you have the extra power.
Since these trucks are primarily 12v, though (blower, lights, etc.), the conversion is just a matter of changing the starter and minor re-wiring. I'd double check the wires to the starter as well, since they'll now be carrying twice the current.
