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Hi
New here but have some input Yendor is correct what happnes is when you draw off of the 12v battery it requires more to recharge and because they are charged in a 24v bank the 24v battery gets overcharged and boiled damageing the battery and the 12v gets flattned causeing these issues. as said above you can run a reducer whitch is what a bus company did with the 12 computer on a 24v bus this works quite well for small things radios and phone charges but as the bus company proved not good enough they have gorne a different route and one i would reccomend whitch is a battery equliser this connect to both 12 and 24v batterys and when the 12v is discharged it draws from the 24v's to recharge the 12v battery this fixed the bus companys problems and if you want 12v ignition just get a 24v relay connect it to ignition to switch the 12's
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