Where can i find an unswitched 12v constant power source on my car so I can tap a wire into?

 

under the dash on the left hand side there are three open prongs. one 12V on one for lights and one for ignition. theres a few references to it out there. i saved the pic but not the thread link and i cant post it cause i dont have anywhere to post it. sorry dude.

search for it and theres some great pics. most surrounding footwell lights. hope that helped