84 w/ or w/o delay/pulse feature?
Delay board for 84 is under the dash not on the motor like later years.
all Motors have a switch to "park" the wiper low on windshield. If that switch is "dead" then wipers can park anywhere.
If have Delay feature the switch is often tied to the delay board so could be switch, board and/or wiring cause problems.
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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave