I found it
Under the fuse box there is a blue connector. On this connector there is a pink wire and a light blue wire next to it.
The light blue is your positive wire. And the pink wire is a controled ground wire.
With it being a controled ground wire, a test light would not always light up, so you might have tested it and moved on to other wires with out knowing you had the correct wire...
Ah I think that search deserves a beer.
