Originally Posted by slakwhere
infection, go to radio shack and you should be able to find a new female power coupler to put in your case in the appropriate size. no need to hack the old one apart. for example, if your power supply was size N:http://www.radioshack.com/product/index.jsp?productId=2102599
if you can't find exactly the size you need, cut the end off the power supply and buy any matched set of male/female for power. they'll have quite a selection.
So I bought piece mentioned above. I'm not completely sure that I have it wired correctly though. It has three prongs. One labeled "center pin", one labeled "shell", and a third that has an arrow pointing from it back to the "shell" prong. This prong is labeled "normally closed" switch.
From what i could find online, I connected a black wire to the "center pin" prong and a red wire to the "shell" prong and proceeded as the O.P. described.
Anyone know what I did wrong here?