As long as the charge light on the RS comes on with the key ON but bike not running, you are fine.
The difference between Airhead charging light behavior usually boils down to the state of repair and/or cleanliness and tightness of a particular bike's wiring harness connectors. There is the possibility of component age and failure, but a corrosion free harness can make all the difference.
The best way to know what's up is using a multimeter on the various parts as you go through the harness to clean and dielectric grease all the connectors. Rick Jones' Classic Boxer Charging book will help here, and there are charging system test procedures in a Clymer's manual or the BMW repair manual too.
Also, the idle on the GS might be a hair low - try an idle speed of 1100. The light may very well go out. My 92 GS idles at 1100 with no GEN flicker but it only has 15k miles on it, so the system is practically new.
Current: 93 R100GS, 03 XR650R
Prior: 73 CB350, 77 R100/7, 83 R100RT, 04 XR650L
I love every motorcycle I've owned and even some that I haven't.
ignatz72 screwed with this post 01-09-2013 at 04:43 PM