My '91 F250 has 2speed wipers, were intermittent wipers an option in 91?- if so what would be involved in putting them on my truck. Just the dash switch or is there a relay that goes on the motor? or do I have to replace all parts?
cheers

 

Back in 87 I bought a new F-150 and it was a good 6 months before I realized I had delay wipers. Try turning your wiper **** counter-clockwise and see what happens.