Electric washer fluid pump?

I had a 1973 Dart Sport, it had a foot operated push bulb on the floor that would operate the washer fluid. I sold that last year and now I have a 1972 Duster with an electric washer fluid pump but i can seem to figure out how to operate it, I think the motor is burnt out and thats why nothing is I try working. Does anyone know what switch operates this?

thanx!