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Two seperate 6v batteries in series vs one 12v is same. Battery cells are in series. Each cell generates 2V. 12V battery has 6 cells in series, 6v has 3 cells in series.

That’s where the various opinions come into play. Some say nothing. I’m on that side. Others say it shortens that battery’s life due to inbalance. If one runs $100 group 31’s, I’d be fine with it, even if shorted life. Decision each makes.

My favorite topic. They do it by pulling 12v off one battery (bank). On the 939’s, this 12v circuit is even ran through the dash ignition switch, as to shut the heater blower off when keyed down. Factory, stock, approved design.

Nothing wrong with adding a high powered DC-DC converter like OP is doing. I like the contactor for auto power off, just make sure it is continuous duty rated (like the one in our PCB for dash power). On the same token, and a lot of people have a hard time with this one, is that the stock...