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Wiring Question ('89 525i)

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    Wiring Question ('89 525i)

    Is the wiring harness and layout/diagram the same for an '89 525i as an '89 325i (both M20B25's)?

    Thanks!

    #2
    What transmissions are they both stick or automatic or vise versa?

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      #3
      Both G260 5-speeds.

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        #4
        for the engine harness, YES. This goes for the M30 too.

        Source: I built a megasquirt unit based on 325i M20 Pin layout and it plug n play into e34 M30 harness. I even got the idle control for AC compensation utilizing this...
        ?

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          #5
          Originally posted by SoopaGhetto View Post
          for the engine harness, YES. This goes for the M30 too.

          Source: I built a megasquirt unit based on 325i M20 Pin layout and it plug n play into e34 M30 harness. I even got the idle control for AC compensation utilizing this...
          YES THIS IS AWESOME. I figured as much, but didn't want to fry something by using the E30 pinout. Thank you.

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