Fitted a Pyramid mudguard extenda today, and when I'd finished I decided to look for the spare socket (heated grips socket?) Thanks to the members of this forum, I quickly located it. I found it best to lie down on the gear side, feet towards the front wheel. Locate the horn and look for a white, taped up connector. I disconnected the connected socket from the plug, and had spare connectors so I soldered the plug with about 3 ft of wire tails, and reconnected it. I could not get a good look at the plug wire colour, but it seems to be white (+) and black(-). the tails I put on were red and black. I plan to install some heated grips later and rather go directly to the battery, I decided that since the socket was there, I might as well use it, just to make sure that the grips are turned off. I know that most grips have a cut off, to stop the battery draining, but I decided to use this method.
