I recently did the old windshield wiper switch relay swap. My intermittent now works along with the mist and low setting. The high however, doesn't. What else could be keeping that one setting from not working?

 

I just switched out my switch yesterday. Fixed my non work int and high wiper setting. It could be the switch, try getting a new one and switching it out again google Maztech in Tampa Florida and see if Jeff will ship you one or help you out.