Join Date: Oct 2006
Location: Green Bay, Wisconsin, USA
Make: GL1500 SE
Get a stethoscope, piece of dowel or even a long screwdriver. Place you ear against the handle and probe with the other end. Listen carefully and rate the intensity of the sound everywhere you probe. Be as analytical as you can be. As you get closer the volume will come up. If the volume goes down you are moving away from the issue. It certainly seems like it is in the area of the alternator but don't necessarily assume A.D.G. It is just as like the alternator itself or maybe even not in that area. Let the noise lead you to the issue. You should be able to get real close. I can tell the difference between a failed front or rear bearing of an alternator. Just be a good detective and you will find it.
I know it is very unlikely but is there any way something could have dropped in the alternator through the cooling slots? (Holes)
Worked on the "big rigs" for 45 years now just riding my Wing whenever I can. Gets cold in Wisconsin.