I ride an03 Ultra year round. Installed heated HD grips near end of last winter, should have done it a long time ago. Should have run the control wire to he accessory switch as it would have made turning them on and off much easier. It is awsome when you find that the temp has dropped and your gloves are at home. Riding even in below freezing temps was much more comfy.
The down side is sometimes they don't last. For some reason this fall I have to turn them up to 6 to get the heat I was getting late last winter on 3. Not sure what happend yet. You will hear alot about the ones that fail but, not so much about all the ones that have worked year after year.
Installation wasn't to bad, they come with instructions for each different bike. 3 wires, 1 negetive. 1 positive with fuse and 1 control (taps into accessory wire on FLHT). That's the 1 I think would have been better to feed from my unused accessory switch. Installing the wires in the handle bars isn't to bad. Using a vaccum to suck a string thru them is probably the best way or pushing a thin coat hanger thru it with a bunch of loops of string taped/tied on the end and using a second coat hanger with a small hook on the end to catch the string loops on the first coat hanger. The grips come with an extention for longer bars. I put it on and then taped over the connector to make sure it would not come apart. then lubed the wires with silacone grease to help them slide thru the bars when i tied them to a string that I had pulled in with the coat hanger. If you don't need the extention once you have pulled the wires thru the bars simply remove the tape and unplug the extention. Either way you may end up with to much cable to push back into the bars when you install the grips. figure how much excess wire yoy have and on the right side of the bars pull the wires out enough to fold the wires back on them selves lie a Z, then tape the overlapped wires and pullthem back into the bars. the less excess wire the easier it is to get the left grip on the bar. Good luck and enjoy whichever way you chose to go.
Lets Ride