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Intermittent Windshield Wipers


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I am driving along the highway, at 50 MPH, after a BCTR pub night (and garage tour) and my wipers start going back and forth.  Turning the switch on and off did no good, but when I stopped at a stop  sign they would usually stop moving, and slowly park themselves.  When I got moving again, they would start wiping.  And then after about 15 minutes of this - they stopped their intermittent behaviour and became normal again.  Any ideas of where to start?
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What the wiper switch does, is earthing the wiper motor : so perhaps the wire from the motor to the switch is earthed intermittently somewhere.
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I have had a similar problem with my 4A but it only happens in wet conditions, so I assume the lead to the switch is getting wet and shorting to earth.

 

Graeme

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