Go here and it will show you what to do. Most undertails install the same way.
What was left of my fender was so butchered that I just got a new rear fender.Thanks for the website reference. It was very helpful. Looks like I am going to have to fabricate something myself to hold the battery and some of the electronics before I put on an undertail.
He made a battery box out of alluminum that he rivited to the homemade fender eliminator. He stuffed some foam tape in the box and just laid the battery in there. He ground the rivets down a little but they still started to wear a hole in the battery. I have to do something else. The power commander and that heat sink looking part are the only other components that he actually attached to the fender. The ECU he tried to velcro on but that didn't hold well. The rest of it he just left floating around. When I first got it I only had about two months of riding before nasty weather arrived so I just zip tied things together and to the frame to secure them. But snow is flying now and I am going to try to do it right.Without a rear fender, how is your battery mounted?
By some fab'd brackets or what?