here are some older threads with links on how to do that.
http://www.rctech.net/forum/radio-el...r-supplys.html
http://www.rctech.net/forum/radio-el...upply-diy.html
i havent gone threw all of it, but i think the biggest thing is to ground the green wire to turn it on and make sure there is a load on it already or it failsafes off when you plug something in.
sorry if thats not any help.