Intermittent Wipers: What's Involved?

Anyone know what makes the intermittent wiper system work? There's a motor, and a control. What else?

Any links to info online about it? A wiring diagram? What about some Chrysler part numbers for the various items, maybe from around 1978?

Thanks.

I converted my '77 Aspen from two-speed to intermittant wipers. Wasn't hard since it was a factory option. I had to add one additional wire to the new/different wiper motor, then change the wiring under the dash and add the new/different switch.

What year/make/model are you working on?

I'm working on a 71 cuda. I think the variable speed wipers are pretty stupid. I don't plan to need wipers, but it would be interesting to try and make intermittent wipers work.