Manuals often specify starter motor power in kilowatts (Kw). 1Kw is 1000 Watts, and dividing that by 12 (Volts) should give us the current draw in Amps. But this figure is just a guide. For a start it may be peak power, rather than average power, that's been quoted. Also bear in mind that the power stated is when the motor is hooked up to a stable 12 Volts. In reality, battery voltage dips to around 10 Volts during cranking due to the massive load on the battery, which obviously reduces current draw and ultimate power output.
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