The new version of the heated grips are vastly improved those in the recent past. I bought a set in Feb of 2018 for my 2017 SESG. At that time they sid they would not fit. They did with a little modification and externally wired. They got hot, but not evenly. Left grip was comfortable at 1.5 to 2. Set at 2, the right grip would burn my hand in one spot. They went out this past fall. I replaced them with the new Kahuna black heated grips.
They were easier to install. No going all the way to the battery. There is a plug right by the left speaker inside the fairing. With a little work I was able to get the wiring internally. Once I had them installed I tried turning them on and nothing. Started second guessing my own abilities. After re-checking everything and trying them AGAIN. But nothing. After reading up on them I found out they will not heat up until the engine reaches about 2000 rpms. So I took of down the street and sure enough. Within 2 blocks they were getting warm amd the longer I rode the more warm they became. They have a VERY even heat. Set them on 3 on a 45 degree day and they are awesome.
I had seriously considered going aftermarket after the early failure of the 1st set. But these have restored my faith in the Harley version. Time will tell how long they last, but I think they will last longer due to the duty cycle they work on. Maybe they are digitally controlled.
Whatever it is, they work great.