Remember these bikes are 20 to 25yrs old now. When I restored my 1989 R100GS-PD last year I was shocked at the state of the electrical connections with the build up of corrosion. How the bike worked in that state, I don't know. I cleaned each and every connection using a needle file and steel wool, and sprayed the connections with cleaners, but was only partially successful. In the end an electrician friend replaced the BMW connector blocks with new bullet connectors and shrink wrapped them. Everything then worked again.
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