2018 579 Wipers Only Work on high setting

[Truckdriven]

(06-20-2023 )BrandonOlsen Wrote:  Have a 2018 579 Peterbilt with x15 Cummins. The wipers only work on top 2 high setting. The medium and low settings when used will only move wipers half way then stop. The wiper motor has been replaced. The steering column blinker wiper knob/switch has been replaced. Both fuses were good and also replaced. Any ideas ? Have Cummins insite and ESA.

I had the identical problem on a Kenworth, it was just a bad relay, it's a cheap and easy thing to replace just to rule it out anyway, on mine there was two relays for the wipers