This might have been done before on here, but this is how I did it this evening.

First, I followed a guide on you tube which involved swapping two wires and left me with a single dip and the sidelight for high beam. No good.

A quick skeg of the wiring diagrams in the manual told me all I needed to know.

First locate the plug for the left hand handlebar switch cluster and undo the clip.

Using a piece of stiff wire, I used welding wire but a staple or paperclip would work; short out the wires in positions 1 and 2 - a yellow and a blue wire. A bit fiddly but a piece of wire will push down the back of the terminals in the housing. (click the thumbnails to make them bigger)
I made an open loop of wire like a tall narrow staple with approx 7mm long legs



Fold the terminal lock back in place and ensure the wire loop is covered.



Now to test, a single beam on dip and both lamps illuminated on main beam



Jobs a goodun!

Cool

I'm pretty sure its in the How To section on here...

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08 Specialized Langster