So why 12V and not 18V? What’s with the different levels for cordless tools 12/18/24.
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It’s a convenient voltage for all the components. It’s a good voltage that works with the battery, headlights, startup motor, radio, etc etc.
The spark plugs have to have voltage stepped up anyway, so voltage doesn’t really matter for those.
Voltages that are too low would waste energy to the resistance of wires in the car, and voltages too high would have to be stepped down. As to why 12 instead of 18, it probably doesn’t make too much of a difference, so… Standards.
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