I am trying to understand an electrical diagram that I got from a local service department. What I am trying to do is connect a 3-wire after marker system to BMW's 4-wire system. The one thing that confuses me is the ground wire that is attached to each mirror. It looks as if the wire is attached to the mirror from two different sides (a loop?) by the looks of the diagram. If there are any electronics experts can you please tell me how to connect the 3-wire system that I have to BMW's 4 wire system?
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