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Author Topic:   Wiper Motor Problems
retired posted 03-24-2013 12:07 AM ET (US)   Profile for retired  
I have 1998 Boston Whaler Conquest and noticed that the windshield wiper does not work properly. Sometimes the wiper blade moves slowly; other times it hardly moves. I have removed the wiper motor and noted that it has three wire connections. One is marked for positive; one is marked for negative; one is marked with an S which I am guessing is ON-OFF switch. Should the wiper motor work if I connect the positive and negative on the wiper to the corresponding battery terminals and I do not connect anything to the S on the wiper?

Also, I don’t understand why the wiper motor has what appears to be a set of points to which the wire from the ON-OFF switch goes?

Also, if I turn the armature by hand the output shaft turns as it should, which tells me that it is not seized up. How do I bench test the motor?

jimh posted 03-24-2013 12:54 AM ET (US)     Profile for jimh  Send Email to jimh     
Wiring of a Boston Whaler boat with electric wipers is shown for a later model CONQUEST at

The wiring diagram shows that an ON-OFF switch supplies current to the wiper motor on an ORG-GRN wire, and unswitched 12-Volts is continually supplied to the wiper motor on an ORG wire. Battery negative is supplied by a BLK wire.

The inference I make from the circuit diagram is the wiper does not operate unless power is supplied on the ORG-GRN wire at the same time as power is supplied on the ORG wire.

retired posted 03-24-2013 06:04 AM ET (US)     Profile for retired    
Thank you for the wiring diagram.

Your inference that power has to be supplied to both terminals + and S for the motor to run makes sense.

jimh posted 03-24-2013 07:39 AM ET (US)     Profile for jimh  Send Email to jimh     
I believe that the wiper motor operates like this: it runs whenever there is power applied to the ORG conductor, until the wiper moves to a certain position, where the motor then stops. This is the parking position for the wiper. When you supply current on the ORG-GRN conductor, the wiper motor operates in that dead band area or parking position, too, and this produces a continual back-and-forth operation of the wiper. If that is correct, then you should notice that when you shut off power with the switch, the wiper motor runs a bit longer until it reaches the parking position. Or something like that.

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