Duetto wiper switch - upgrade to 2-speed?

[acurtiss]

Hi,

A question about windshield wipers. I have a 67 Duetto with the standard 1-speed wiper and on / off toggle switch. To have a 2-speed wiper, is it possible to just install a later 2-speed switch, or does this actually require a different wiper motor altogether? I don't mind changing the switch, but for obvious reasons would rather not change out the motor.

Thanks,

Aaron

[papajam]

If I'm reading the parts books right, the single speed 3-wire wiper motor for your Duetto, Bosch #0 390 326 002, is the same motor that's in our 68 GTV which has two speeds. I have a NOS motor in the parts pile so if you can wait a few days, I'll fire it up and get some wire color codes for you. I'd think though that there might be a little rewiring to do at the 2-speed switch and perhaps the footswitch as well.

[acurtiss]

If that's the case, then it sounds like it's possible to do without messing with the wiper motor. My foot switch is currently disconnected (another project, another time), so that doesn't present a problem quite yet.

Thanks for the info!
Aaron

[papajam]

The Bosch #0 390 326 002 wiper motor IS a 2 speed. The three wires, at least on our NOS spare, are red, white & green (coincidence?). The red wire is the 'park' circuit and is always hot. The green wire is 'high' speed and the white, when powered WITH the green, is 'low'speed.

[acurtiss]

Thanks for the research on this, Jim. I think I understand how this would work. I wonder if the one-speed setup on my Duetto is 'high' or 'low' -- it's not particularly fast or slow so I couldn't guess without looking at the switch. Now to find a two-speed switch...

[papajam]

I'd guess that the speed you have now is the faster of the two. Notice I didn't say 'fast'.