When the driver turns on the wipers, the switch completes a circuit that allows power to flow to the relay or transistor. The relay or transistor then switches on a high-current circuit that supplies power to the wiper motor. The motor runs at a high speed until the driver turns off the wipers or selects the low-speed setting.
When the driver selects the low-speed setting, the switch opens the circuit that powers the relay or transistor. This causes the relay or transistor to switch off the high-current circuit and turn on a low-current circuit that supplies power to the wiper motor. The motor then runs at a low speed until the driver turns off the wipers.
Some two-speed wiper systems also use a variable resistor to control the speed of the motor. The resistor is connected to the switch and allows the driver to adjust the speed of the wipers by rotating a knob or lever. The resistor works by varying the resistance in the circuit, which causes the motor to run at different speeds.
Two-speed wiper systems are a common feature on modern vehicles, and they provide drivers with a convenient way to adjust the speed of the wipers to match the weather conditions.
