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"Chasing an intermittent problem is frustrating, can become expensive in so much as labor and replace parts and has the potential to ruin a riding season.
Best to ride until failure and deal with it when the problem is no longer "intermittent".
I spent two years chasing an intermittent system/engine cut out problem only to after a lot of labor, parts swapping/replacement, solved its self with never a smoking gun to show what of the twenty things I did actually fixed the problem."
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Hi 217Don,
There is a potential problem with how BMW mounted the diode boards on the 1983 (and other year) bikes. They used rubber vibration isolation mounts that crack and fail. When I opened up my front engine cover, the diode board was hanging by two of the four rubber mounts on my 1983 RS.
There are also issues with these mounts getting a good ground path. Should the ground path be intermittent, you will experience intermittent charging.
<a title="Rubber Mounts-One Broken" href="https://www.flickr.com/photos/brook-reams/19455468766/in/album-72157654880664060/"><img src="https://farm1.staticflickr.com/273/19455468766_168edde576_z.jpg" alt="Rubber Mounts-One Broken" width="640" height="480" /></a>
Rubber Mounts-One Broken
You can learn more about this, see how to test your diodes, and see how you can replace the rubber mounts with solid metal mounts that insure a reliable ground in this document on my site.
12 BMW 1983 R100RS Check Diode Board, Replace Rubber Mounts=
I hope this is helpful.
Best.
Brook Reams.