Mystery wiper problem

[Potone1]

I have an 86 ranger 2.9 5 spd. When my ignition is turned on and I turn on the wipers they will not stop. It looks like a bad ground to me. I measure 12 volts at the black terminal of the motor when running and I have to turn off the ignition for a few seconds for it to stop. With every thing turned off I get several ohms to ground from the black terminal.

 

[triumphrider-1]

Try this, see if helps/fixes the problem.

http://www.therangerstation.com/tech_library/phantomwipers.htm