if changing harness and all it could scare someone not familiar with wiring, i didnt want to redo all of mine so i got one that was easy to do...just unbolt old one bolt new one in its place and just put inline fuse in the hot wire and it came with the ehc, was so easy anyone could do it, took half hour or so. the hardess part for me was the days of researching on this forum to figure out that mine was bad and not some other issue going on, i never had mine tested. it worked good in the summer but once it startted getting cold at night it wouldnt do anything but flash the turn signals..previous owner had unhooked the horn so i know he knew it was bad when he sold it to me..once i seen horn unhooked i fixed the wire to it and it would sound off sometimes while lights flashed. this is a great forum for us beginners on bigdog bikes with out it i probably would have took a loss n moved on..i tell everyone my bike is my ford..working on it more than riding it .. hopefully that will change and i can make it my chevy lol