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Weird Main Relay Issue

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    Weird Main Relay Issue

    '88 325i vert. Engine only starts/gets spark when I jump the main relay, it won't start with the actual relay installed. I've tried two brand new relays (both are OEM) and neither work. Is it really possible I bought two bad relays? What else could be causing this problem? Thanks.

    Sent from my SM-G960U using Tapatalk
    1988 Alpinweiss 325i Convertible

    #2
    Test the relay pins using 9v battery or similar and see if it switches correctly
    89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

    new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

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      #3
      I'll try that. Just wondering what else it could be. I'm stumped.

      Sent from my SM-G960U using Tapatalk
      1988 Alpinweiss 325i Convertible

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        #4
        If you know putting power from #30 to #87 lets the car run, I would focus on #85. I think that is the ground signal form the ecu?? Wiring diagram says its a green wire from the MCU called the "Main Relay Control"

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