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Mystery light behind tach.
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mach1460



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    Post: #1
    Mystery light behind tach.

    Working on my 72 I have upgraded to LED's and fixed my fuel gauge. As I have the dash apart I am replacing the bulbs for the lights, cig lighter and wiper bulbs. Well the P/O had cut and spliced a bunch of wires that I have already fixed, but I have a press in (not twist in) bulb socket with black/ green stripes and red(pink?)/green wires which comes out of the main harness right behind the tach area. obviously its goes to the tach or dummy light cluster.
    One thing I dont understand is that it doesnt fit in with the printed circuit because the bulbs have the electrical "connectors" that when you twist them in they connect. Does anyone know where it goes or what its for??
    My car is a non-tach car and I have no open spots in the back of my gauge cluster.
    (This post was last modified: 12-24-2010 05:48 PM by mach1460.)
    Offline 12-24-2010 03:19 PM
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    72HCODE


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      Post: #2
      RE: Mystery light behind tach.

      it is not original to the car.

      all the bulbs that go into the instrument cluster are the black twist in sockets with the wings that make electrical contact with the circuit board.
      Offline 12-24-2010 07:29 PM
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      71fastback



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        Post: #3
        RE: Mystery light behind tach.

        Any possibility it could be an interior light for the floor?
        Offline 12-25-2010 12:30 AM
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        mach1460



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          Post: #4
          RE: Mystery light behind tach.

          (12-24-2010 07:29 PM)72HCODE Wrote:  it is not original to the car.

          all the bulbs that go into the instrument cluster are the black twist in sockets with the wings that make electrical contact with the circuit board.

          I can tell that it is original because its still wrapped into the harness and its has very old faded colors. Im not saying it goes to the cluster but thats where its located. See the pic. no electrical contact "wings" either.
          I dont think its a floor light, its pretty short coming out of the harness maybe 3-4 inches.


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          (This post was last modified: 12-25-2010 01:01 AM by mach1460.)
          Offline 12-25-2010 12:45 AM
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          OMS



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            Post: #5
            RE: Mystery light behind tach.

            Hard to tell from the pic but could it be the socket that goes into the headlight switch dash light?
            There would be one for the headlight on the LH side and two [1 lighter, 1 wiper ] on the RH side of the column
            Don
            Offline 12-25-2010 12:39 PM
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            mach1460



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              Post: #6
              RE: Mystery light behind tach.

              Its not those either they are all "accounted" for. Those are actually the bulbs I am replacing right now, the small 1895 bulb which are a twist in. This "mystery light" is a press in bulb.

              Heres a better picture hopefully it will help me figure this thing out. You can see the Lights light wires and socket with the blue/black wires.


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              (This post was last modified: 12-25-2010 01:06 PM by mach1460.)
              Offline 12-25-2010 12:49 PM
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              72HCODE


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                Post: #7
                RE: Mystery light behind tach.

                Did thecar originally have a clock instead of a tach?
                Offline 12-25-2010 01:14 PM
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                mach1460



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                  Post: #8
                  RE: Mystery light behind tach.

                  I guess there's a chance. The original owner had used what seemed to be a sawzall to cut out on opening for an aftermarket tach. What's a way to find out what it had from the factory? I seem to remember fragments of the dummy cluster but that may not be original either
                  Offline 12-25-2010 02:08 PM
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                  72HCODE


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                    Post: #9
                    RE: Mystery light behind tach.

                    i think if you had the clock it used that type of bulb to light up the clock face.
                    if the car had a oem tach there would be a 2 prong rubber connector for it coming of a green -red stripe wire. i think the plug is colored burgundy.

                    i see some seriously hackery in the picture for your head lights switch connector also. all those wires that have connectors crimped on them is not original there was a plastic block that all the wires keyed into that fit on top of the head lights switch.
                    Offline 12-25-2010 03:52 PM
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                    mach1460



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                      Post: #10
                      RE: Mystery light behind tach.

                      I don't know if I go as far to say serious hackery. If you look there is the original normal block plug in to the headlight switch and there are only the two splices that I just did because the last guy had cut them. Obviously the crimped wires are not original. The only wires that I am asking about the green and black and the pink and green with a press in bulb on the end. I do appreciate the input though
                      (This post was last modified: 12-25-2010 11:33 PM by mach1460.)
                      Offline 12-25-2010 04:34 PM
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