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Testing wiper switch and motor

Testing wiper switch and motor

Old September 24th, 2016, 09:35 AM
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Testing wiper switch and motor

The wipers quit working on my 66 and I'm hoping to test the switch and motor before I start replacing stuff. At first they worked but seemed like every other time I drove it they wouldn't work until they stoped so I got under the dash and pulled the wires off the switch and put them back on and the wipers worked again. Now I'm getting nothing out of the wipers, I'm getting power to the switch and power on the yellow wire at the motor
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Old September 24th, 2016, 10:48 AM
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The wiper switch is supplying a ground to the wiper motor through the light blue wire. The dark blue wire is supplying a ground for the washer pump at the the motor. The yellow wire is unswitched power from the fuse box to the motor.

http://people.ucalgary.ca/~csimpson/...ass_Wiring.gif
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Old September 24th, 2016, 12:19 PM
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The Chassis service manual has good info for this and without it, it can be tricky to understand. (at least it was for me) As said above, the switch controls the ground side of the circuits and the motor is hot full time. I suspect a ground problem at the switch with intermitent operation.
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Old September 24th, 2016, 12:20 PM
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That's good to know, had no idea that's how it worked, thanks
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Old September 25th, 2016, 10:58 AM
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ok i was reading this i took a test light and it doesnt seem like im getting power on the yellow wire by the wiper motor , i checked both sides of fuse and power on both sides
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Old September 25th, 2016, 05:22 PM
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See if you have voltage at the bulkhead connecter and that its tightly secured.
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Old September 26th, 2016, 07:43 PM
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Originally Posted by oldcutlass View Post
See if you have voltage at the bulkhead connecter and that its tightly secured.
OK what and where is the bulkhead connector
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Old September 26th, 2016, 07:55 PM
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Under the master cylinder, where all the wires go to and from the inside of the car.
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Old September 26th, 2016, 09:46 PM
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Originally Posted by oldcutlass View Post
Under the master cylinder, where all the wires go to and from the inside of the car.
OK I see it, looks pretty dirty so I am going to disconnect it and try to clean it up. Thanks for the help there i hope this solves it
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Old October 2nd, 2016, 04:35 PM
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finally got a chance to look at my wipers. turns out the motor was getting rusty inside, cleaned it up and its working again. i know it wont last long but atleast i have wipers for now.
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Old October 2nd, 2016, 05:32 PM
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You never know, it may out live you. Glad you got it.
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Old October 3rd, 2016, 12:00 AM
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Originally Posted by oldcutlass View Post
You never know, it may out live you. Glad you got it.
That is absolutely true
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