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Ok, I was mistaken in how I was describing the setup I was talking about. The system needs to run with a 12v alternator. And it runs through a Series/Parallel switch. http://www.zafr.com/trucktcom/parallel_sw.htm for a quick run down. BUT, I don't think those are rated to keep running the 24v...

An inverter would be a much safer and more practical way to go for light loads like this.

http://bus.getdave.com/Docs/12Von24V/ Has some good info on 24v systems needing to run 12v. It doesn't show the system like the ones I have seen though (probably because of the 24v charging system). The stated reason for not running both 12v and 24v at the same time is listed as: "This is...

Most pyrometers are self powered (the heat in the probe generates the small voltage used by the gauge.) With the light in the gauge being the powered part of it (easy swap to 24v bulb.)

Yeah, having CORRECT information is the goal here. Thanks for all you have provided so far though. Hopefully we can get this cleared up. I know it can be done, I only wonder what we would have to change to make it happen? If I only need to get a 12v alternator, and swap a little wiring around...

Oh yeah, I was planning on putting a solargizer on each battery, which would help keep them topped off fairly well.

Ok, but my dodge, and a LOT of other trucks I know of, run 12v batteries in parallel. I know that replacing those batteries should ALWAYS be done in matching pairs (from the same batch is even better). On the cement trucks I worked on, we had 4 batteries, we had full 12v for everything in the...

Ah, and tell me again why we can't also run the batteries in parallel for a high amp 12v load? I know a number of OTR trucks have multiple batteries (2 or 4), that they run most stuff on 12v(in parallel), and run the starter and a couple other things on 24v. Is the only reason NOT to do this is...

definitely interested on price as well!