Fuel gauge / cluster wiring problem!

Discussion in 'Technical' started by TheTransplanter, Aug 1, 2018.

  1. TheTransplanter

    TheTransplanter Member

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    Hi All

    Since owning my 73 the fuel gauge has never worked.

    First thing I did was to ground the sender and check the wiring but this was ok.

    So without pulling the cluster I bought a new voltage regulator as I was ordering other parts anyway. I fitted the regulator which made no difference at all. So now I know I either have a faulty gauge or wiring!

    I studied the wiring diagram and couldnt get my head around it at first because of a difference in wire colors, but I think I know where the issue is but before I go flashing a live wire I wanted some confirmation.

    On the cluster connector, position 17 shows as black/with green, on my vehicle its a solid black wire. Now when looking at the diagram the black/with green is an ignition live which terminates and feeds several different components. All the other components on the vehicle are working.

    So my question is:

    1. Should position 17 (top left in pic) on the connector in fact be a 12v ign live (this position feeds the voltage regulator)?

    2. In the diagram there is some kind of termination/splitting of the wires (in orange highlight pen). Is this a connector somewhere, or is this all soldered together & taped somewhere in the loom?


    IMG_5158.JPG IMG_5159.JPG

    If my theory is confirmed, it should just be a case of running a new ign live to the cluster in pos. 17 :)
     
  2. TheTransplanter

    TheTransplanter Member

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    Ok, went with my instinct and powered up pos. 17 on the connector. This gave power to the regulator and the needle moved every so slightly to the E line.

    Knowing I have at least half a tank of fuel knew this still wasnt right.

    So I also bridged the sender connector and the gauge immediately went to full.

    So it seems I had two problems which is good and bad ;)

    Now I have solved the cluster issue, I now have to purchase a new sender, and hopefully that will be the end of it :)
     
    Krazy Comet likes this.
  3. Acornridgeman

    Acornridgeman MCCI Wisconsin State Rep Moderator Supporting Member

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    Pull the sending unit and check the float. Floats do go bad and cause low readings.
     
  4. TheTransplanter

    TheTransplanter Member

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    Yeah, going to have a look before I order one, I just need to keep a can of gas in the trunk and run down whats in the tank :)
     
  5. stumanchu

    stumanchu Stuart

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    When I took my sending unit out, the float was missing. It wasnt even in the tank anymore.
     
  6. Krazy Comet

    Krazy Comet Tom

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    Floated away??
     
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  7. Mavman72

    Mavman72 Gone backwards but lookin' forward

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    If fuel tank is less than half full. Jack up left side of car so rear left tire is approx. 6 inches off the ground...you can now pull sending unit out without dumping fuel on the ground...
     

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