MRE,
I got the heaviest gauge inline fuse holder I could find at AutoZone, I think it was 12 gauge. I got one that used the same sized fused as the bike so I won't have to carry two different types of fuses in my tool kit. I installed a ring terminal on it and stacked it below the bike's positive battery lead. I left enough extree to be able to pull the pig tail out from the battery compartment should the fuse need to be replaced--no need to pull the battery that way.
From there, I extended the fueholder's pig tail with some 12 gauge hookup wire. (I soldered the connection and used a piece of heat shrink with the glue gunk inside.) I routed it out the front of the battery box cover and immediately across the bike in the area of the fuel rail. Once across the bike, I ran it along the frame brace that runs from under the left grille cover to the left engine mount, and on up to the inner fairing cover. Once routed, I installed split loom, and then wrapped with loom wrap. I zip tied it in strategic locations on the left side of the bike. Be sure to include a couple of extree inches of wire so the inner fairing can be pulled out and disconnected, when servicing the bike.
As far as the socket goes, I used one of the upper right dimples on the vertical surface of the left inner fairing as a guide for drilling a hole for the socket. If you install it on the right hand side, I guess you wouldn't need to cross the wire across the motor--might be a bit simpler. When you install the socket, it's hard to get enough torque on the nut to keep it from moving around. I got it as tight as I could and then applied some plastic epoxy all around the nut on the back side of the inner fairing.
For the ground, I soldered a 12 gauge wire to one edge of the nut that secures the socket. I cut the wire so it was a few inches long and put a spade connector on it, again, so I can completely remove the inner fairing when I need to work on the bike. Use a mating connector and make another line that goes to the closest ground connection you can find. Make sure to gender the positive and negative wire's spade connectors so that you can't hook it up backwards.
If you do it right, the leads will different enough in length that you can't hook it up backwards if you wanted to.
If you need some explanatory pictures, I may have some I can scrounge up.
-Matt
"If it has breasts or a motor, you're gonna have trouble with it."