Ahoy
I made this post on the KORider (Hyosung) forum on how to install a 12v power outlet on your moto. I believe that the directions will work for most sports touring bikes and the principles should transfer to all motorbikes.
Here are the instructions, hopefully you find them simple and helpful.... BTW I have no affiliation with super cheap auto and am not intentionally plugging the KO forum.
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I have recently installed a 12v power outlet into the dash of my GT650s so I can charge my phone and camera while on tour.
The process will take a couple of hours but is relatively simple and I will make my best effort to explain it in a simple way.
Tools and supplies
-Cordless drill
-Whole-saw to fit
-Pliers with wire strippers (to strip the ends of all the wires)
-Phillips head screwdriver
-15amp mini blade fuse
-Waterproof mini blade fuse holder
-All weather 12v power outlet
-Cable ties
-One screw cable joiner
-30cm of waterproof wire
Here is the end result
http://i.imgur.com/1ifA1.jpg
http://i.imgur.com/16Bil.jpg
Under the pillion seat
http://i.imgur.com/7Ghrn.jpg
and with the fuse cap off
http://i.imgur.com/wPoN9.jpg
Instructions
First you will need to unscrew the plastic dash with a Philips head screwdriver.
Secure the dash and drill a hole with the whole-saw attachment either to the far bottom left of far bottom right.
Place the power outlet into the freshly drilled hole and screw the dash back onto the bike.
Unscrew the two screws that hold the seat in place so you can access the bikes battery, disconnect the battery from the terminals,
Run the cables from the power outlet on the inside of the bikes frame and connect the black wire to the negative terminal on the battery. Run the red wire through to the glove compartment under the pillion seat.
Connect the red wire from the outlet to the waterproof fuse holder using the one screw wire connectors. Place a 15amp fuse in the fuse holder and secure the holder to the inside of the glove compartment using cable ties. Connect the other wire from the fuse holder to the 30cm of waterproof wire (using the connectors) and run that wire through to the positive terminal on the battery.
Make sure to arrange the cables in a tidy manner and use the cable ties to secure the wires to the frame of the bike wherever you see fit.
I am happy to answer any queries over IM or through this thread.