What makes a 6v wiring system??

During WWII 24V was used extensively in aircraft and in some other applications as well, partly because some of the same radio gear used in aircraft was also used on the ground. It's really too bad that "right out of the box," the US car makers didn't go to 24V instead of 6, and later 12. VeeDub stuck with 6V for a long period after most others had gone 12.


It's not just wire size. Voltage drop everywhere is decreased, through connection terminals, and switch contacts. It is much more difficult to get a starter to operate efficiently at 6V than it is or 12.

The same thing is true of transistors, in such devices as high power audio (or RF) amplifiers. Up to a point the higher the voltage you can operate the device, the more efficient and more linear you can make the thing.