The best solution is to buy or borrow the Bentley manual for the e36 BMW. It is available on Amazon or from several other online sources. It has wiring diagrams in it, and I have found them to be about 99% accurate which is remarkably good for this type of reference book.
now available bmw r80g/s wiring diagram NEW This brandnew wiring diagram is made of two laminated cards that fits in your G/S toolbox. On the back both cards have a short overview of the most needed tools, nuts, torque specs, light bulbs, used oils and other specs.
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