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I think that 24v to 12v converter setup thatveas linked earlier might be the way to go if you want to run a lot of 24v accessories. Keeps the load equal across the batteries at all times and should the converter fail you can easily wire the truck back how it was to get 12v to the buss bar.

I think he's planning on running two seorrate systems. One 12v battery for the truck stuff and two 12v batteries wired for 24v for accessories. The singular 12v battery for the truck won't be involved in the 24v system like it is from the factory

Never said mine were wired in series, just that it would be possible to do it. Much like rubbing a bunch of 12v glow plugs off a 24v system via a huge resistor. Possible but not without its shortcomings.

I put dual electric fans on my truck, you could do the same and wire them in series for 24 volts. The reason I did this was so incoukd ensure all tubes in the radiator had a fan pulling air across them. Our radiators are quire tall so instead of one huge fan I got two smaller ones. They work...