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No, it does need 24v. But Rick's point was that the rear battery is usually not discharged much. It's usually the front battery that gets discharged, because that is the one that supplies 12v to the vehicle. Leave a light on, and only the front is going down. The rear will be sitting...
That's what the fusible link is supposed to do, but they don't always, often leading to confusing symptoms.
I know which one I'd rather change by the side of the road on a rainy night! o_O
That's one of the many reasons I don't like them. They are a relic of the past. Fuses are far superior in every way except one - cost to the vehicle builder.
That is the only reason they still exist.
Until you have checked your fusible links, you are just chasing your tail. Start with your fusible links. Keep the batteries disconnected until you have checked them, or you might fry another alternator. You may have already done so.
"Fusible links 101" in the Helpful Threads sticky.
If they tried to jump start it, it's likely that they fried a few fusible links, along with your alternators. Those will have to be replaced. In the "Helpful Threads" sticky (at the top of the CUCV forum) there are a few links to a lot of info on the fusible links. I suggest you start there...