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Old 07-27-2010
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Thanks Mitiempo, I think that's what I meant to say. I go from the house battery neg terminal to the shunt, then from the shunt to the neg bus. Then I wire the neg bus to the engine block. Then I wire the neg terminal of the start battery to the bus.

The reason I am trying to figure out where the starter current flows is so I know which wires to size for the start current. It seems that with this arrangement no start current actually flows through the shunt. Why is it a 500A shunt then?
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