ASUS Rampage II Extreme, which wire is the ground wire on the temp pro

[jlaavenger]

On the ASUS Rampage II Extreme, which wire is the ground wire on the temp probe lead? There are three 2-wire temp probe leads that came with my mobo, the book tells you how to plug them in but doesn't clarrify which wire is the ground wire. I think the lead plugs have the letters wst printed for one wire and a number and letter for the other, but that doesn't really tell me anything.

 

[Raxus]

Black is ground