Step 1: Layout Your Items
Step 2: Begin Taking Apart Your Existing Handgrips
Once the ends are off you need to remove the existing rubber grip from the metal tube. These are usually glued on and don't want to come off easily. Slide a flat head screwdriver between the rubber and the bar and torque it around left and right to break the seal of the glue.
After some twists you should be able to slide the old grip off the bar. If not see the next step.
Step 3: Remove the Throttle Rubber
Step 4: Test Fit the Replacement Throttle Side Grip.
In this case the throttle side grip can't slide on because of a lip of plastic on the existing throttle. Time to snip it off.
Use dykes to snip away the extra plastic, and then run some sandpaper over it to smooth out the end. Don't forget eye protection when cutting. Those little bits of plastic can hurt.
Step 5: Find Some Power for the Wiring Harness
What you want is to connect it to switch power that only comes on when the bike is running. This is typically called accessory power.
In my case (DL-1000) there is an extra switched power lead behind the radiator. I couldn't actually fit my hands in there so I tapped the power close to the battery.
Step 6: Test Your Power Source
At this step I also connected the negative to the battery terminal directly. Some people connect their negatives to the frame of vehicles, but in this case that would be a bad thing, since this is an aluminum and steel frame, running current through it would cause an electrolytic reaction between the two metals that would weaken the frame and possibly kill you eventually. So don't do that.
Step 7: Press on the New Grips.
Step 8: Take the Bike Outside and Test Out the New System.
Route the wires around the bike trying to follow existing wire pathways.
Let it heat up and make sure everything is working correctly.