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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Windshield wipers working, slowly.

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Old Aug 27, 2019 | 01:39 PM
  #1  
Mattd3083's Avatar
Mattd3083
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Windshield wipers working, slowly.

The wipers work normally for about 6-8 strokes, then they slow, and slow more. they move, stop half way up, keep moving and go down, sit for maybe 7 seconds and repeat slowly, they seem to work quicker if you press the button for the windshield washer, but its hard to drive in the rain constantly pressing the button.

The truck is 86 F150 Lariat. it sat for a while before i purchased it and ive had to replace lots in it already. 2 fuel pumps/filter, starter, alternator, thermostat, the wipers themselves.
 
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Old Aug 27, 2019 | 03:41 PM
  #2  
matthewq4b's Avatar
matthewq4b
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From: St Albert, Alberta
Time for a new Wiper motor By the sounds of it the insulation on the windings on the armature has broken down and is shorting out.
 
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Old Aug 28, 2019 | 08:53 AM
  #3  
1986F150six's Avatar
1986F150six
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From: Sheffield, AL
I, too, suspect the motor is weak. Just as a zero cost test, why not remove the passenger side wiper arm and repeat your procedure described in the 1st post. This will reduce the load by 50%.
 
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Old Aug 28, 2019 | 01:12 PM
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The_Scatch
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This happened to me earlier this year and was the early signs of a charging problem. If your lights are bright when the heat/ac and wipers are running then no biggy. If they are dim, check the power.
 
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