I just installed a new windshield wiper transmission and washer pump into my '79. The transmission will operate at low and high speeds but the problem I'm having lies with the washer pump drive. Regardless of what I do, I cannot get the washer to quit pumping. It pumps at low and high speeds... whatever speed the transmission is running. This happens without even selecting the pump. If I do push the switch for the pump, it will start but will not stop on it's own. I have tried every combination for the wire plugs. I even pulled the dash bezel and tried a different switch with the same results. What am I missing?