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I was finally able to get another look at the wiring and I can confirm the loom does have a positive connection at the starter solenoid that runs to the starter relay. That wire is red but is covered in a black sheath so I missed it. However, the (male) connector tab on the solenoid this wire goes t...

Unfortunately the old harness was a melted blob so we can't use it as a reference. I will double check but I thought I was getting continuity between the brown ground wire by the coils and the black one (the arrow is pointing to) in my original post. I am not sure what this black wire is, the connec...

Just started helping a friend get a 1970 r75/5 running. He bought the bike site unseen from an auction, upon receiving the bike we discovered the main wiring harness was completely fried. So, we are re-wiring the bike. We ordered this wiring harness: https://shop.maxbmw.com/fiche/DiagramsMain.aspx?v...