Also interested in exactly what pieces were bought/ modified.
Exactly the solution I was hoping for!!
The Count
So as someone who works at a company that makes literally hundreds of different styles of heaters, I was curious as to why nobody else had tried my solution yet. A heater is a heater, plain and simple. Resistance over a length of wire. I figured as long as I had the wattage relatively close to the factory grips, the system wouldn't know the difference between factory and aftermarket.
If I was to redo my installation, I would use oxfords. But please note that they are higher wattage than most heated grips, so there's a potential that they draw too much current and pop the fuse that the grips use. I haven't done enough digging to know if that's the case, I'm not sure what fuse they actually use. Since I didn't want to waste money in case my idea didn't work, I'm actually using some cheap chinese heated grip pads:
Not the greatest idea ever, and I wouldn't recommend you choose these. They don't produce much heat. Symtec heated pads have much much higher quality and aren't much more $$.
Here's what you'll need:
Heated grips or heated grip pads
solder & soldering iron
heatshrink
As for how to wire them: Disassemble the "nose" by removing the fairing, headlight, windscreen, etc. Inside, you'll find there's 2 wire bundles ziptied up behind the dash. Snip the zipties, and look for a small white connector in each bundle. Like this:
Ignore the third white connector not found in the 2 wire bundles, this is for a GPS. Remove these plugs from both sides, and cut the heatshrink off each as best you can, as we will need enough wire to solder to them. Cut the connector off your grip or heated pads, and solder (with heatshrink) to the two male-end connectors that you just removed. Polarity doesn't matter, since the heaters are nothing more than a big resistor. Make sure any soldered connections are covered with heatshrink, and plug back into the female connector on the bike. Reassemble the bike in the opposite order, and pat yourself on the back.
In my case, I also wired in separate 2 amp fuses to each grip (between the pad and the male connector), in case the cheap chinese quality proved to be problem. If I was using a brand name kit, I'd have skipped this part as space is very limited.
A few disclaimers: I can't be held responsible if you mess up, and I also can't guarantee your dealer will turn the grips on (if you think this might be a problem, have them turn the feature on before you do your own install). If anyone wants photos, I can disassemble and show exactly where to find everything, and how to wire them. Hope this helps.