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The slow speed has never worked on my 69's windshied wipers, but last week the whole system went out (or won't stop). When i turn the switch off the motor won't quit. I got out the test light and found that the center wire is hot all the time. When i disconnected it the motor stopped. I also found that there was no power going to the wiper switch even though the fuse was not blown. I have no idea what is correct or not so hopefully yall can help me out. Thanks.
 

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sounds like a bad ground..
the wipers are always hot and the switch is the grounding point.. this completes the circut..
 

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Think the 69's and 72's are the same. Had the same problem with my park style 72. Problem looked like the switch not opening the ground line. I checked the ground leads to the motor connector. They opened and closed as I hit the switch. Problem turned out to be the park circuit inside the wiper motor. Put a rebuilt motor in there and all was well.
 
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