Wipers are on the cowl...how???

I would remove the wiper arms and run the wipers for a few minutes, run the switch through its positions.

Then when the switch is off install the wiper arms, and run a cycle or two to see where they will land with the load of the wipers installed. (Keep windshield damp spray bottle of water, Windex etc)

Adjust as needed, go find some rain and enjoy.

Keep in mind that you might have an intermitnant issue that you "fixed" by bumping a wire or connector, or the wiper motor itself.