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Wiper trouble

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Old Today | 02:12 AM
  #1  
Yuichi Ishitomi's Avatar
Yuichi Ishitomi
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From: JAPAN
Default Wiper trouble

My 71 Corvette's wipers are malfunctioning.

When the wiper switch is turned on, both the low and high speeds work normally.

When the switch is turned off, the wipers stop correctly, and the wiper doors close properly.

However, if I press the washer switch while the wipers are operating, the wiper doors suddenly close, even though the wipers are still working.

No washer fluid comes out either.

Where should I begin troubleshooting this problem?

Any advice would be greatly appreciated.
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Old Today | 07:57 AM
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From: Chapin SC 29036
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You might have more than one problem. but if the door closes before the wipers are parked it sounds like the vacuum switch interlock is defective. The switch sits on the passenger side where the wiper would hit it when it parked. If it is bad, you want to replace it with a switch that has a black top. For some time there were switches that had a white top and they had a high failure rate. The vacuum switch is in the red circle.

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Old Today | 09:27 AM
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Hello,
It's quite possible to put the wiper switch connector on the switch upside down.
The small tab was added to the switch but it's still possible to make the connection upside down.
Has the connector been off lately?
Regards.....





Last edited by Alan 71; Today at 09:28 AM.
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Old Today | 12:23 PM
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From: Chapin SC 29036
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Here is the wiper wiring that was done for my 69, but I think you will find that the 71 is probably the same.
There is also a vacuum system diagram.


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Old Today | 02:15 PM
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Alan 71
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From: Westminster Maryland
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Hello Robert,
Such good work you generate.!!!
Some folks are color blind which makes following your drawings a bit of a mystery sometimes.
Might you consider giving even a 1 letter guide for the colors.....
B blue, G geen, etc?
Regards....
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