Yeah, they dont come prewired unless ordered from Northern Brewer. I did my own though, its not that hard. There is a pic floating this forum somewhere that shows exactly how to do it. You'll need some wire/extension cord and some soldering skills. If you cant solder, you can use wire nuts. It's a tad small on the inside of the controller, so I ran small lengths of wire from all the inside connections to the outside of the housing, and wired it that way. Just make sure to tape it all off to avoid shorting. I dont have the link to the pic anymore, but I'm sure yuo can find it with a search. good Luck!