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Delay wipers...

Discussion in 'The Garage' started by BlackDog714, Sep 20, 2003.

  1. BlackDog714

    BlackDog714 1/2 ton status

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    Ok, I am at a loss. My delay wipers don't work, but low and high work just fine. Any ideas???

    This is really driving me nuts. /forums/images/graemlins/angryfire.gif
     
  2. BlackDog714

    BlackDog714 1/2 ton status

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    No one has had delay wiper problems before?

    Its an 86 GMC K3500.
     
  3. Triaged

    Triaged 1/2 ton status

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    Could be alot of things but I would bet it is the circuit board that is in the wiper motor. AFAIK you can only get a new one from GM (rebuilt wiper motors do not come with it).

    But first you need to check that the correct voltage is getting to the circuit board. Unhook the 4-pin connector that goes to the wiper motor. You should get 12V to one in Hi 12V to another in Lo and a lower voltage in the Lo one when you have it set for intermittant.
     
  4. HarryH3

    HarryH3 1 ton status Author

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    The timer works on a RC (resistance * capacitance) time constant. So a broken wire in the control circuit or an open rheostat will make the time constant infinite, which means the "delay" bewteen wipes will be forever... /forums/images/graemlins/eek.gif So also check to make sure that the resistance in the circuit really is variable. /forums/images/graemlins/cool.gif
     

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