The Ron Francis relay converter I mentioned earlier, although I didn't try to reverse engineer it, I did pull the cover off and remember it had 2 "ice cube" relays in it with a lot of wiring converting a 3 wire circuit into a 6 wire circuit. You could probably eventually figure it out, if you bought the right relays, but for $59 I decided that was cheaper.
http://www.ronfrancis.com/prodinfo.asp?number=SS%2D6
