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Another notable mention about the CUCV factory system is both alts are the same. Keeping a spare alt and a rebuild kit or two sure makes things easy. I need to practice what I preach on this.

Only problem with not using 12V is that is what the truck needs to run. Rather than invent another wheel, keep a spare alt on hand or keep a charged jump box onboard. What if your 24v fails?

If you were to run the CUCV on a straight 24V charging, you would eventually get a battery imbalance as one battery (front one) would have a constant drain vs the back battery. This would be similar to a center tap for power. With 2 12v alts even if one fails you could swap batteries back and...

In their stock form, the dual 12V isolated ground alts do exactly what you want. They keep both batteries charged with varying loads of 12V and 24V. If you only want to run one alt , do as Rustystud says and run the Vannar. Running 2 alts could be done with 2 iso ground 12V or a 12 and 24 iso...