Why do you need to replace the alternator? Is it not charging? Before you condemn the alternator, do me a favor & check your cruise control fuse. If it is blown, replace it & check the charge output. If not, I will get the instructions for replacing the alternator.

OK, It's a pretty straight forward operation. Have you located the alternator assembly? It should be on the left side of the engine toward the passenger peg. There are 3 bolts holding it on that are accessible from the back of the motorcycle. The majority of things I've read state to pull the rear wheel for accessibility, however you may be able to get creative with 1/4" extensions & swivel sockets or Gearwrenches.

Make sure your battery is completely disconnected BEFORE you start working. Access to the Alt. bolts may be better if the battery is removed from the bike. Once you get it, & all the other connectors disconnected, pull the 3 12mm headed bolts from the alternator & pull the alternator toward the back of the bike. You may need a little help on this by means of a prybar or long screwdriver to help things along. Once you get it out, may I suggest a viable replacement for your consideration? It is very popular with wing owners... http://www.chromeworld.com/ProductDetails/ProductDetails.aspx?pid=%7B2597ecee-8c4b-49b5-b9d9-fc07be598c44%7D