One should be your BLUE.
One should be your GROUND.
One should be your SYNC. (H sync)
But can't tell you which is which without knowing what they are coming from. (color codes wise)
If I had to guess..... brown would be your BLUE, black would be your GROUND, white would be your sync.
I would try the GROUND and H Sync on the three pin connector first.
Blue only has one place it can go.
EDIT: Oh yeah, that is a bare wire isn't it? Hmmm, knowing the source would indeed help.