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No a solenoid switch (full name) does not control a cars electrical system.

The solenoid is an electrically operated switch that sends power to the starter motor which in turn cranks the car's engine to start it.

The reason a second (electrical) switch is needed to crank the starter motor, is that the starter motor requires such high voltage that the key would melt if all that power were to run through it.

In other words; When you turn the key you are sending a small amount of power to the solenoid switch which in turn sends a large amount of power to the starter motor.

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15y ago

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