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@dave bushell wrote:
Material cost is cheaper when using 12v as compared with 6v as current flow is half that of the 6v system and this means there is less voltage drop over a given length of cable arriving at it’s destination, I.e. the headlamp bulb. On a 6v system, this voltage drop can be reduced by using a heavier (and more expensive) cable. Thus when you’re manufacturing thousands/millions of vehicles, there’s quite a material cost savings with 12v
I agree when I designed my wiring harness using the Scott and Miller drawings I upgraded the wiring sizes. That became a small issue with routing as the harness became thicker. However it works real well.