After taking this part to two different mechanics I just had to throw it in the garbage, they opened it for me and showed me how the contacts were burnt and rusted inside, there was no way to make the windshield wipers work due to burn circuits.It is incredible how Amazon sold a defective product, unfortunate many months went by until I decided to replace in my Mercedes Benz, by then it was too late for a return procedure.$79 stolen gracefully from my pocket.