I'm not 100% sure on this, but I think all 12v systems are powered from the battery, even when the convert is turned on. I don't think the wiring from the converter can handle the amperage at full load, but your battery wires can, and distribute the voltage/current (through something) Through isolation diodes, the converter only provides voltage/current to maintain a charge on the battery.
Am I all wet on this one? Must be something I just don't understand.
Edited: Okay! I'm all wet on this one. I just did not think a converter could handle the full load current like a battery could and would then rely on the battery. Hey, I learn something every day, but what do I know, I'm an S.O.B.
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