Intermittent issue with wipers not working

Hello,

It sounds like you have a high/low relay that is not working right. To be sure here is a guide to help you test the relay and the wiper wiring diagrams so you can see how the system works with the relay locations as well:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.