No, the truck didn't die, presumably because I was a 1/4 mile from home when it went to electrical limp mode. The dash warning indicated that all nonessential electrical was shutting down. I have no idea how long it would've run ignition/ECU only, or what amperage the 48-12V converter puts out to keep up, altho I suspect a fair amount, probably 100+ amps. If the battery was shorted, I would've expected boiling, etc. If open, this could be explained by these symptoms. Idk, but I have a moto, and work, so I'll get it figured out this weeeeek.
Given the frequency of Ram batteries failing early, I'll pull this one and get it tested, hopefully tonight. Some have reported here that their batteries still pass load testing, but I'm not sure that could be believable either, especially when the dealership replaces them so often. I have a buddy that runs a CDJR dealership, I'll ask him what kinda numbers he sees.
I have driven home in older cars with the headlights getting dimmer and dimmer.
I know this woulda looked like charging system, but Ram batteries fail far too early and often, so bought one when I could, still returnable.