Why are the wires to a starter motor very large?

The wires to a starter motor are very large to accommodate the high current required to start the engine. During cranking, the starter motor can draw a significant amount of current, often exceeding 100 amps. Larger wires reduce the resistance and minimize voltage drop, ensuring that sufficient power reaches the motor for effective starting. Additionally, thicker wires help prevent overheating and potential damage during the high-current draw.