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How many amps does a car starter draw off 12v battery?

The amount of current (in amps) drawn by a car starter from a 12V battery depends on several factors, including the vehicle's engine size, starter motor specifications, and battery condition. On average, a typical car starter can draw anywhere between 100 to 200 amps when cranking the engine.

During the initial moment of starting, when the starter engages the engine's flywheel, it draws the highest amount of current. This inrush current can be significantly higher than the average cranking current and can reach up to 300-400 amps for a few milliseconds.

As the engine begins to turn over and the starter motor starts spinning, the current draw decreases. Once the engine is running, the starter disengages, and the current draw drops to a negligible level.

It's important to note that these values are approximate and can vary depending on the specific vehicle and its electrical system. For accurate information, it's best to consult the vehicle's owner's manual or technical specifications.