I've seen a few posts of people looking for rattles on the rear fender. I found two of the rear fender rattles. The second one was driving me crazy.

The first and easy one to find was rear tail light. If you take off the saddle bags you can see the two bolts that hold the lower tail light and sides to the fender. The first rattle I found was the lower tail light rattling against the fender. I loosed the two bolts on each side, lifted the light up as tight as I could and tightened the bolts back up.

The second one is in a similar spot. If you look close at the lower bolt mentioned previously, you will notice that the rear fender main mounting bracket goes behind it. However, the bolt that holds on the lower tail light and fender sides does not attach to that bracket. There is just enough space to get a nice rattle from engine vibration. I could hear it rattle when I hit the rear saddlebag mount with my hand. Looks like they attempted to solve the problem by sticking a thin piece of rubber behind it but it wasn't working. Mine was rattling on the left side but I'm sure it can happen on either or both sides. I stuck a small piece of weather stripping rubber between the two pieces and that took care of it. Oh and my license plate reflector was rattling against the fender. Oh and my saddlebag mount was loose when I first got it. Oh and ...

Hopefully that's all of them.

 

Good stuff. I just installed a '10 rear fender on my '09 EGC no rattles yet!

 

Thanks for the info. I just noticed the light panel on mine is loose. I was wondering how much of a PITA it was going to be to tighten it up...

 

I just had to fix this last night. Its been rattling for a couple thousand miles and made a very nice bike sound like an old Honda.
Where you're pointing in the first picture was my issue. The bracket bolts on the inside of the fender (centered) and wraps around to bolt to the bottoms of both saddlebag supports. Where it comes out from underneath the fender, on both sides, there are supposed to be rubber strips that are stuck on the chrome fender support by way of some adhesive. These apparently fall of easily as I've read a number of posts of people looking to track rattles down and they find this.
I put some thick weather stripping foam in there.
Of course, I didn't just take off the bracket. I took off the whole fender just to look around. Cleaned up that fender bracket with some alcohol and got the foam weatherstripping installed well.
Fired the bike up and just had to listen to it run for awhile afterwards. Its amazing how good it sounds, even at idle, without rattles eminating from every assembly point.
Knock on wood, I think I have finally fixed all the factory rattles!