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Wiring Up M20 Swap

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    Wiring Up M20 Swap

    I've been posting here quite a bit and so far everyone has been super helpful! Ive run into one little standstill before I got my ETA car turned into a M20b25 machine :D

    The engine harness and engine come out of an 89 325i. My car is a 87 325e. The C101 from the engine harness has some extra pins in it that the C101 from the ETA fuse panel doesnt have inserts for.

    After researching this I've found that I'm missing slots for pins 8, 9, 14 and 15. I've found some shotty diagrams online but I really want to make sure I don't fry anything once I hook the battery up. What should I do about these extra wires/pins on the 89 "i series" harness.

    According to the diagrams they are wires for:
    8 - DME Cont/Idle Control
    9 - Tachometer
    14 - Speedometer Signal/ OBC
    15 - Starter/ Unloader Relay

    All of these things seem important so I'm not understanding how the old C101 plug from my 87 fuse panel doesn't have sockets for these pins/wires?

    Any input on this would be amazing as its the last thing holding me up from starting her up :)

    #2
    I may have just found the answer to my issue. Didn't see this after searching for a while but just now found it. Can anyone confirm that this would be the same thing that applies to me?



    Seem's to be my exact issue, correct? If so, it looks like a fellow R3v already helped me out :D

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      #3
      Ayup. That looks about as I remember it. Make sure pin 20 isn't hot on one side and ground on the other- by late 1990, this is true, and results in smoke leaving the harness...

      t
      now, sometimes I just mess with people. It's more entertaining that way. george graves

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        #4
        Does anyone have any input about pin 15? I'm in the same situation of the OP in the thread above.

        Thanks

        Comment


          #5
          I'm just left with the pin 15/18 issue. Do I need pin 15 wired to the unloader relay if pin 18 is already going there?

          Any help is appreciated as its the last thing holding me up!

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