I installed Heat Demon grip warmers on my '09 Electra Glide Classic with electronic throttle and stock handlebars. This is a tip for you if you install these yourself as I did.
After not taking off the outer fairing and trying to pull out the electronic throttle and having it disconnect from the connector half way down the handlebar (thank God it didn't pull out any wires), I cannot stress enough to do the following: Take off the outer fairing, look under the radio and see the wire coming out of a hole at the bottom of the handlebar, follow that wire to it's connection beside the radio, disconnect the connection, lead the connection to the handlebar opening under the radio (you will have to take off a few zip ties). Now you will have enough length to pull the electronic throttle out of the handle bar easily.