Posting this for anybody whose early single speed wiper motor is worn out and wants to replace it with a two speed version. I've also recently changed the washer bag to a version with an electric pump to improve on the pathetic trickle from the foot operated pump. It retains the function of the foot pump to turn on the wipers at the same time. This is the wiring to make it work. It also needs a 3 position wiper switch. For the electric pump it needs a 10 amp diode to prevent the wiper switch turning on the pump.