How to Reduce the Speed of a Windshield Wiper Motor

Written by nicole schmoll
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How to Reduce the Speed of a Windshield Wiper Motor
Slow your wiper motor down with a few parts and a little elbow grease. (man working on car image by palms from

Sometimes car owners want to reduce the amount of energy flowing from their engines that is used to power various car functions, such as windshield wipers. If you have an energy-efficient vehicle, such as a hybrid or completely electrically-powered car, and want to lower power consumption by reducing the speed of your car's windshield wiper motor, there are a few simple steps you can perform to accomplish your goal.

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Things you need

  • Motor speed controller kit
  • Wiper motor

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  1. 1

    Open your vehicle's hood and locate the wiper motor. Look along the heater wiper motor tray, near or on the firewall in front of your windshield; this is where it is most commonly located.

  2. 2

    Buy a motor speed controller kit to apply the supply voltage to the wiper motor for a variable, rather than continuous, period of time. Keep in mind that the kit will use two timers as a pulse width monitor to control the amount of time that your wiper motor receives a high output of voltage. By reducing the voltage drawn to the motor, you can reduce the speed at which the motor operates.

  3. 3

    Follow the installation instructions on the kit, making sure you have all parts, and correctly orient the diode and electrolytic capacitor. Slide two of the included terminal blocks toward each other to create a 4-pin block.

  4. 4

    Locate the high- and low-speed and common or ground motor wires coming out of the wiper motor. The low-speed wire will be at the top of the motor and the high-speed wire will be at the bottom of the motor, and the common wire will be directly below the low-speed wire. Connect the low-speed wire to the "MOT+" input on your kit and the common wire to the "-" sign on your kit's 4-pin terminal block, which should effectively reduce the amount of speed heading to your wiper motor.

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