[V8] windshield wipers go in intermittent mode on their own

[Ed Kellock]

Patient is a 1990 V8q.  Was driving it the other day and about 5-10
minutes into the trip, the windshield wipers made a swipe and a little
later another and so on.  
 
I moved the stalk through all the positions, restarted the car, and
swapped the intermittent relay, but it still has the same problem.
 
Any input is much appreciated.
 
Ed
Colorado Springs