As above - don't be put off by the size of the DIN type socket, it is pretty much the bike industry standard power supply these days. They are much more robust, more watertight, have better contacts, are more compact and smaller than cigarette lighter sockets.

I've mounted two, one in each pod behind the front indicators, the right hand one is wired (as GULG suggests) off the lighting circuit via a relay to give a switched supply for heated kit etc. The one on the right is direct to the battery so I have a power source without the key and into which I can plug the Optimate for battery charging.

I wouldn't bother with the Touratech kit, its hugely over priced. The socket they supply in the kit (which is a good one mind) is a Hella model and available more cheaply elsewhere. FYI I got my sockets and plugs (Hella) from an online Chandlery supplier (a good source for all waterproof electrical kit).

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