Windshield wipers intermittently not working?

This can be the switch or the wiper motor so when you turn the wipers on high, please check for power at the purple wire, if no power is present replace the switch if you do have power replace the motor.

Here is a guide to help also you should check the motor ground as well:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Here are the wiper wiring diagrams so you can see how the system works. Check out the images (below). Please let us know what happens.