Question about 1983 Chevrolet C3500

1 Answer

Three connector windshield wiper motor wiring problem

I have a three connector windshield wiper motor in a 1972 Chevy C60. It is a A1 Cardone model 40 154. One terminal is by itself, the other two are paired and obviously go to the two connector plug that in turn goes to the wiper switch.When the motor fell out, it took the wires with it. To what does the single conector attach?

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  • 2 more comments 
  • garyalanyoun Sep 07, 2009

    Hi Ron,

    That was my first thought and so ohmed the terminal to find out. It is electrically isolated from the case. The case has a brass strip to ground the inner sleeve of the rubber mounting grommet when the mounting screw is tightened.

    Gary

  • garyalanyoun Sep 07, 2009

    Hi Again Ron,

    Therein is the problem. When the motor fell out, it took the wiring with it and so I do not know where this wire went. I know there was a wire attached before it fell out, but I didn't look close enough then to recognize it now. There are no wires long enough to reach the terminal now that it is correctly mounted. That may be a clue however why the motor was not correctly mounted in the first place-- the wire did not reach. (The maintaince on this snow plow was provided for 35 years by the county shops for Kern County California.)

  • garyalanyoun Sep 07, 2009

    Hi Ron,

    No intermitent wipers or washer on the pump. I have fabricated such a connector before I realized the case was already grounded. My paranoia is the warning on the new Cardone motor saying hooking it up incorectly could damage the polarity of the magnets causing the motor to lock up. The orginal motor did work dispite hanging from one of three mounting screws and the bell crank. It worked sorta after I remounted it and had only one wire, hooked up. We think we burned out a armiture winding when it would sweep and stop in the same place. Taking off the wiper arms reduced the drag so the motor would continuiously run by probably coasting by the bad winding.

    The first replacement motor may have been damaged when I tried to power it up to test it. I applied power to all three terminals at various times and the motor never turned. Measuring voltage drop, the most was the outboard terminal at about 10vdc, the middle was abut 8 and the single one about 6. Naturally, I am reluctant to try that on the latest motor especiall when the instructions say install the motor completely before energizing it.

    Sincerely,
    Gary

  • garyalanyoun Sep 07, 2009

    Hi Ron,

    I think you were correct from the get-go. It is a ground wire. My neighbor, who restores old cars helped me. (He has thin arms and could reach the switch.) What we found is the connector that orginally went to the motor terminal. It had tangled in other wiring when the motor dropped. The other end of the wire was grounded to the Power TakeOff panel that I had removed to gain access. The mystery now is how could the old wiper motor work at all and that answer was probably the failing wiring shorting to body ground.

    Sincerely,
    Gary

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  • Master
  • 855 Answers

Should be the ground wire.

Posted on Sep 07, 2009

Testimonial: "Ron, You were right-on with your first comment. The motor windings are electrically isolated from the body of the motor. See comments."

  • 2 more comments 
  • Ronald Park
    Ronald Park Sep 07, 2009

    That should ground the housing. Check the wire with a test light and see if it ever gets hot. If not it is an additional ground. In the mean time I'll do some research and try to find out for sure.

  • Ronald Park
    Ronald Park Sep 07, 2009

    Also do you have intermitent wipers?

  • Ronald Park
    Ronald Park Sep 07, 2009

    O-kay don't worry about intermitent wipers. How this wire hooks up is you will have to add a connector that the mounting bolt will ga thru then after it is tightened you connect the wire it does not go to a plug on the motor.

  • Ronald Park
    Ronald Park Sep 08, 2009

    Glad to help!

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How do you replace windshield wiper motor on a 1997 ford e250 van


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25287270-15uk5heqgoha5mc4ejw3dmql-1-2.gif
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25287270-15uk5heqgoha5mc4ejw3dmql-1-5.gif
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25287270-15uk5heqgoha5mc4ejw3dmql-1-9.gif
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25287270-15uk5heqgoha5mc4ejw3dmql-1-14.gif
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    gm-06-00-1079.gif



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