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Car battery..........

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The battery is not a constant current source but it is a constant voltage source. The 12V/75A specifications mean that it will hold the terminal voltage to 12V for current form 0A to 75A. In practice you will not get exactly 12V over the range but voltage will be closer to 12V. So don't worry about the current if you require only 30A.

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A car battery is switched at the rotor. The rotor turns delivering the path to ground, through the spark plug, for your switched voltage. When you apply 12 volts to the autotransformer the voltage is stepped up. When the rotor loses contact the transformer is grounded out. When the stator lines up you get the 12 volts through the autotransformer and on to the spark plug.

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