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DYI: Early Model Headlight/Highbeam/Foglight Relay Mod

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    DYI: Early Model Headlight/Highbeam/Foglight Relay Mod

    First off, I am not entirely sure if there are any risks involved in this procedure. I looked at (and have posted) the factory wiring diagram and do no see any reason this should harm your car. However, replicate this procedure at your own risk. The pics and write up are based on a 1987 325is and I do not know if this will work for other years / models.

    I know there are a number of DIYs on this topic, but I figured I would document my project as well.

    After converting my sealed beams to euro elips I found that my lowbeams turned off when I turned on my highbeams. As I will be installing HIDs into the lowbeams shortly I needed to allow the highbeams to turn on without turning off the lows.

    The added benifit to this mod is that you can also run your fogs with highbeams now.

    Here is the wiring diagram that I used


    Tools and parts I used:
    Needle nose pliers.
    Soldering iron and conductive solder
    short lenght of stripped wire (less than 1" used in the final product)

    First I located and removed the highbeam relay K3.


    Looking at the back of the relay I found pin 30 and pin 87a.


    I ran a small lenght of wire between the relays to give the solder a framework. I suppose you could just run a line of solder between the two pins...


    Next, I ran solder along the wire fixing it securely to the pins. I was very careful to only connect pins 30 and 87a.


    I pluged it in and tested. All lights functioned normally.



    Thats it.
    Last edited by digital_cowboy; 10-13-2008, 11:27 AM.
    -Will

    1987 325is, 1989 325i, 1997 318i
    Parts for Sale

    #2
    Do yourself it-er, thats a decent little write up.
    Originally posted by blunt
    i would jerk larry king off while tonging jflips ass if h0lmes would blow his head off

    Comment


      #3
      lol I just noticed that... DYI
      -Will

      1987 325is, 1989 325i, 1997 318i
      Parts for Sale

      Comment


        #4
        This doesn't mean you can run only fogs as well does it?
        Yours truly,
        Rich
        sigpic
        Originally posted by Rigmaster
        you kids get off my lawn.....

        Comment


          #5
          No you still need the lows.
          -Will

          1987 325is, 1989 325i, 1997 318i
          Parts for Sale

          Comment


            #6
            Sorry for bringing up old thread but My euro 325i fog lights work with the park lights on as well as the headlights. What is different with the euro cars that we don't have to tap the 2 relays together?
            Originally posted by Nicademus
            My car beats off to that car. :bow:

            Comment


              #7
              The only thing if it matters is the fogs stay on when switching to high beams.
              dlm

              Comment


                #8
                Low beams with the High beams on

                So, years later, how did it turn out?

                I am doing the same mod on my 318i today, swapping out the sealed beams for some ellipsoids. The high beam wiring is simple, hot and ground. For the low beams, I capped the high beam wire, and wired in the hot/ground for the low beams. I have been wondering how I can keep the lows on when the high beams are switched on. Would it fry something to just wire the high and low together on the low beam fixture?

                Or does your relay trick do it?

                Thanks!!

                Comment

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