1975 BMW R75/6: Replacing Left Side Handlebar Switch

I had to replace this switch and decided to document “what wire goes where” inside the headlight shell on the circuit board and to the ignition switch and headlight relay.
I also explain how to map information found in various wiring diagrams to the labeled areas on the circuit board. There are some places where things got confusing for me in going between the various published wiring diagram(s) and the circuit board inside the headlight shell, so I hope this material helps others avoid being confused.
You will find this write-up here:

Here are a couple pictures from the write-up.

Broken Left Side Headlight Switch

Broken Left Side Headlight Switch

New Switch Assembly with (8) Wires

New Switch Assembly with (8) Wires

Wiring Circuit Board Inside Headlight Shell [Source: MAXBMW]

Wiring Circuit Board Inside Headlight Shell [Source: MAXBMW]

Green/Black Wire Is A Ground Wire-Goes to Brown Section of Circuit Board

Green/Black Wire Is A Ground Wire-Goes to Brown Section of Circuit Board

2 thoughts on “1975 BMW R75/6: Replacing Left Side Handlebar Switch

  1. Hi Brook,

    Once again your help in my own project has been tremendous as you’ve just made me realise I have a shorted neutral diode! Now I just have to get to it…

    Anyhow I wondered when you were talking about ground on the circuit board…you say area 30, but do you mean 31? Area 30 is the permanent, unswitched live positive feed isn’t it?

    Once again thanks for all your great advice, photos and the massive amount of time you must invest in creating such a useful knowledge base.

    • Hi Matt,

      Ah, thank you for catching my “fat finger” mistake. Of course you are correct, it is “Area 31”. I’ve made the edits. I appreciate you finding the mistake for me.

      Best.
      Brook Reams.

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