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ray_mcavoy · 04-06-2018, 08:59 PM

You have a single speed wiper motor. The motors & switches you're seeing with more wires/terminals are 2-speed.

The switch is on the ground side of the circuit. One wire is the fused power feed to the motor that is live whenever the ignition key is on. The other wire leads back to the dash switch (that completes the circuit to ground to run the motor).

Note that there is also a parking switch inside the motor / gearbox assembly. That switch also completes the cicuit to ground (motor case) and allows the motor to run independent of the dash switch until it reaches the parked position. So if your motor is running as soon as you apply power (dash switch off), it is either (a) not in the park position and will eventually stop there if you keep it powered on, or (b) the park switch contacts are stuck and keeping it running all the time.

04-06-2018, 08:59 PM	#2
ray_mcavoy Registered User Join Date: Nov 2009 Location: Sherman, ME Posts: 2,358	Re: One wire wiper switch You have a single speed wiper motor. The motors & switches you're seeing with more wires/terminals are 2-speed. The switch is on the ground side of the circuit. One wire is the fused power feed to the motor that is live whenever the ignition key is on. The other wire leads back to the dash switch (that completes the circuit to ground to run the motor). Note that there is also a parking switch inside the motor / gearbox assembly. That switch also completes the cicuit to ground (motor case) and allows the motor to run independent of the dash switch until it reaches the parked position. So if your motor is running as soon as you apply power (dash switch off), it is either (a) not in the park position and will eventually stop there if you keep it powered on, or (b) the park switch contacts are stuck and keeping it running all the time.