You are absolutely correct Dan, but generally speaking with the automotive electrical systems the 12v systems are carrying about half the current that the 6v systems do. This was one of the main reasons they moved to 12v in the 50's, ie., to save on materials like copper wire and brass contacts. The automobile industry has earned the reputation since the beginning of reducing costs as much as possible and less material meant less cost to build. There’s a big difference between the 6v & 12v lighting and heater wiring and switches.
Another good example that comes to mind is in the aviation and transport industries where higher voltages like 24v and 32v are seen often.
Denny Graham
Sandwich, IL
