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I attached a pic of what I am trying to do. Now if the alternator is 12V I can charge the 2 batteries on the right but I can't charge the battery on the left without taking the blue wire off. I have a 24V inverter that is 1500watt and was wondering what would happen to the battery on the left if I had the truck running so the 2 batteries on the right stayed charged but the left battery was not being charged. Would it simply discharge and I be back to 12V or what exactly would happen? Is there any way at all to charge all 3 batteries at the same time without sending 24V to the truck and blowing all the circuits up, but still have a connection for 24V hookup?