318i M10 unknown connections/grounds crank no start

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  • Perchu
    Noobie
    • Mar 2026
    • 10

    #1

    318i M10 unknown connections/grounds crank no start

    Hello I've recently bought a 84' 318i the car had set for a number of years and has had many different parts taken from it so ive come here for help.

    I bought a new wire harness which it was missing we were able to get mostly everything plugged in and this got the car to crank which is a step in the right direction,
    However it is not getting fuel or spark i currently think the spark issue is due to the ignition control module not being plugged in however, it will be soon since the harness i bought had the leads for the siemens/Telefunken ignition control module and not the Bosch one that came with the car.

    This being said I'm now going to compile a few pictures of different wires and plugs that have me stumped so if you recognize or can tell me what any of these things do it would be of great help to me.

    Thanks!
  • bakedfool
    Noobie
    • Mar 2026
    • 8

    #2
    I have an m10 harness I pulled off, I can check in the morning for that relay and perhaps a few of the other connections and see what’s plugged into what.

    Comment

    • Perchu
      Noobie
      • Mar 2026
      • 10

      #3
      that would be very useful, thanks

      Comment

      • Sunnyledge
        Wrencher
        • Nov 2017
        • 220

        #4
        In your third photo the blue/green and yellow/green connect together. Photo from my 84 318i
        Attached Files

        Comment

        • Sunnyledge
          Wrencher
          • Nov 2017
          • 220

          #5
          In your first photo are the connectors for multiple relays positioned on the left inner fenderwell. The Vemo is the fuel relay.
          Attached Files

          Comment

          • Sunnyledge
            Wrencher
            • Nov 2017
            • 220

            #6
            The connector in your 1st picture with the heavy red wire is for the main relay.

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