fan led swap

[johnny sublime]

ive done it in my xbox and im just wonderin which is + and which is - the cables are clear so no red cable black cable to help me so can anybody help

 

[Ducky Spud]

just hold the led against the wires,if it lights up solder it in place, if not, flip it round! Its only a tiny amount of power going to it so wouldnt worry about shocks are anything... other than that simple solution Im not sure lol