If you think about it electrically, the final path for any and all circuit paths is back to to the battery through the frame. So the frame basically equates to a big bus bar that is much larger in gauge than any wires connected to it. So other than a wire in a circuit being too LIGHT in gauge, doesn't that make the gauge of the wire in any circuit irrelevant?
So while having a wire large enough to carry the anticipated current is important, being TOO large will not change the amount of current that any one particular circuit is going to use. Fusing is the important current controller not the wire gauge.
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