i was looking for info in this exact topic. So far i have figure out that the switch will only feed voltage to the unit. so you will need a 6 volt reducer if you plan to run the original wiper motor. I believe that the motor is two speed (unlike the new motors that are fully speed adjustable) I have also heard that this type of motors, are very interchangeable through out the years...so i hope to find a 12 volt motor so I can switch it up and use any regular switch and not have to worry about the voltage reducer.
that's what I know now, if someone else knows anything more let us know!