Here is the part to buy:
http://www.ebay.com/itm/DC-12V-F-Fah.../141777090187]
http://www.ebay.com/itm/DC-12V-F-Fah...-/141777090187
I am not much of a electrician so here is my question : Where do you get the 12V to power the controller (red and blue wires)? Red is hot and blue is ground? Are terminals 1 & 2 wired inline with one side of the fan switch?