Pretty much everything is covered here...

http://www.xt660.com/showthread.php?t=16274

You can't miss the spare connector under the dash panel, it's a 12V ignition switched supply on the sidelight circuit (so it will also be live with the key in the P position). The connector block itself is next to useless though as there doesn't appear to be a male end available to fit it - you'll have to chop it off and start again! Just make sure you fit an inline fuse in the accessory circuit.

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