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'91 318is --> '94 M50B25 wiring

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    '91 318is --> '94 M50B25 wiring

    Anyone got a good diagram, or a site that's useful for wiring up this sucker?

    "See, we're adding a little something to this month's sales contest. As you all know, first prize is a Cadillac Eldorado. Anyone wanna see second prize? Second prize is a set of steak knives. Third prize is you're fired."

    #2


    There is one.
    Project Thread | Instagram | Phoenix, Arizona Events Thread

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      #3
      Another quick question... this is the chart they have listed, but it shows no wiring matches from the E30 --> E36 harness for the fuel pump relay or the Check Engine light control. Would these wires carry over from harness to harness, or is this correct?

      I hope this makes some sense.

      Chart showing pin arrangement when swapping e36 motor into e30 chassis.


      From Pin # For To Pin #
      '86-91 325 '92+ 325i, M3
      1 Alternator charging 25
      2 Oil level sensor
      3 Not used
      4 Coolant temperature sender 12
      5 Oil pressure 23
      6 Oxygen sensor, heater relay 13
      7 Ignition switch 21
      8 Not used
      9 Not used
      10 Oil level sensor
      11 Diagnostic connector 19
      12 Check engine light control
      13 Fuel pump relay
      14 Oil level fault set
      15 Not used
      16 SRS connector/diagnostic connector #6 not used
      17 Not used
      18 Starter 18
      19 Not used
      20 Not used
      C104 under glove box Engine speed output, BK/BU Tach 20

      "See, we're adding a little something to this month's sales contest. As you all know, first prize is a Cadillac Eldorado. Anyone wanna see second prize? Second prize is a set of steak knives. Third prize is you're fired."

      Comment


        #4
        I haven't done the swap myself yet. I'm sure someone could answer that, like Brew who I believe said that the wiring came pretty easy to him.

        I believe the check engine light isn't operational unless you do something. You may have to search for the keywords. Kylebes1(sp) said something about it. The fuel pump relay wiring I'm not sure what it does. Again I can't say for sure because I haven't done it myself.
        Project Thread | Instagram | Phoenix, Arizona Events Thread

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          #5
          Originally posted by eightyfoure
          I haven't done the swap myself yet. I'm sure someone could answer that, like Brew who I believe said that the wiring came pretty easy to him.

          I believe the check engine light isn't operational unless you do something. You may have to search for the keywords. Kylebes1(sp) said something about it. The fuel pump relay wiring I'm not sure what it does. Again I can't say for sure because I haven't done it myself.
          Yeah, I'm asking about this because I'm building a "plug and play" connector for the E30 --> E36 wiring harnesses, so I don't have to butcher either one.

          "See, we're adding a little something to this month's sales contest. As you all know, first prize is a Cadillac Eldorado. Anyone wanna see second prize? Second prize is a set of steak knives. Third prize is you're fired."

          Comment


            #6
            Good idea, sorta like Treehouses' without the price. I wish I could help more.
            Project Thread | Instagram | Phoenix, Arizona Events Thread

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              #7
              Originally posted by eightyfoure
              Good idea, sorta like Treehouses' without the price. I wish I could help more.
              Assuming they work well and are proven in several different applications, we'll sell them at a decent price.

              I'm going to use our current project, Spoon's car as a test bed to experiment on, and hopefully will end up with a decent working product by the end of the week.

              "See, we're adding a little something to this month's sales contest. As you all know, first prize is a Cadillac Eldorado. Anyone wanna see second prize? Second prize is a set of steak knives. Third prize is you're fired."

              Comment


                #8
                found this in a search here so take it for what it is(double check wire/function as you go)
                Attached Files
                "A casual stroll through the lunatic asylum shows that faith alone does not prove anything."

                Friedrich Nietzsche

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                  #9
                  Nice but this is a three year old thread. You might want to just post the diagram in a new thread.

                  Comment


                    #10
                    cant blame me for being bored and wanting to help
                    "A casual stroll through the lunatic asylum shows that faith alone does not prove anything."

                    Friedrich Nietzsche

                    Comment


                      #11
                      Originally posted by SchnellerVert View Post
                      Nice but this is a three year old thread. You might want to just post the diagram in a new thread.
                      it is nice to have all the info in one place.

                      Comment


                        #12
                        This was my wiring. I made a plug-to-plug adapter too. it actually fits perfectly into the loop where the diag connector sits.
                        I haven't started it yet, got starter motor fitment issues:(

                        For all you M52'ers, X20-C101 wiring breakdown, need a little help!

                        I have been told M50/52 X20's are the same. I'm starting to beleive it.
                        THis is how I ran the wires:

                        X20 => C101
                        7 => (EWS)
                        12 => 4
                        13 => 13
                        15 => 15
                        18 => 18
                        19 => 11
                        20 => 9
                        21 => 7
                        23 => 5
                        24 => 16
                        25 => 1

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