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Headlights cause temp reading increase....

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  • #16
    Originally posted by RatRidgeRoadster View Post
    Yes, that's what you want, but it blows my theory about the speedo not being grounded out of the water.

    While we're talking about grounds, take a look at your front harness ground point and verify that your negative battery cable is connected to both the engine firewall and the engine block (rear plate).

    Click image for larger version Name:	 Views:	2 Size:	161.7 KB ID:	514444

    Rat, I’m sorry, but I can’t relate to that first photo — where exactly is this ground lug? (My battery -‘ve does attach to both points, BTW)

    CHRIS

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    • #17
      That would be the body ground tab behind the grille
      72 Pimento w/overdrive

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      • #18
        Originally posted by bartman View Post
        Chris - the voltmeter does not use the 10v voltage regulator. The Temp gauge and the Fuel gauge share that regulator. What does the fuel gauge do when the temp gauge changes as the headlights are turned on?
        I can confirm the temp and fuel gauge both increase when the lights are turned on — the fuel gauge much more slowly.

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        • #19
          Originally posted by lfmTR4 View Post
          That would be the body ground tab behind the grille
          Yikes — not sure about access....do you mean between the rad and the grille??

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          • SapphireBlue72
            SapphireBlue72 commented
            Editing a comment
            Access can be attained through the twin front valance radiator openings (visible in photo), if there is no radiator guard or air dam blocking entrance. Otherwise, the radiator side-shroud must be removed- 4 screws on top.
            It is quite simple, a ground cloth & strong light are helpful.

        • #20
          Click image for larger version  Name:	 Views:	2 Size:	343.4 KB ID:	514585

          Originally posted by ChrisW View Post
          I can confirm the temp and fuel gauge both increase when the lights are turned on — the fuel gauge much more slowly.
          Then, Chris, I would follow Neddie's comments earlier that the voltage stabilizer may be bad, or may have a bad ground. The VS is behind the Speedometer. The VS is grounded through its case. If you remove the speedometer to get at the rstabilizer, you can test its ground by running a little wire with alligator clamps from the VS case to a known good ground, then testing the headlights to see if the needles jump on the instruments. If they still do, then I think it's time for a new regulator - they're less than $15 for the solid state ones (highly recommended rather than the old bi-metallic ones).

          Biggest issue is removing the speedometer to get at it, unless you are young and very flexible which I am not. After you replace the stabilizer, it would be a good idea to test the temp/fuel gauge with the headlights. It is #2 on the diagram above (from Moss). NFI
          Last edited by bartman; 09-10-2018, 06:29 PM. Reason: Spelling and screwing with this picture posting system.
          1976 TR-6 BRG - CF57239U
          Carbs by Poolboy
          Rear Camber Kit, Rear Hubs by Goodparts
          Gear Reduction Starter by TSI
          Distributor by British Vacuum

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          • ChrisW
            ChrisW commented
            Editing a comment
            What exactly is inside this VS? What is its purpose?

        • #21
          Chris,
          In post 5 you mentioned your heater not working.. Might not be jammed but could be one of the unused terminals on the switch grounding on the switch surround.. had similar and just needed the bend the terminal back and insulate..
          Tim

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          • ChrisW
            ChrisW commented
            Editing a comment
            BINGO! Th@nks so much.

        • #22
          Here’s an article describing what the vs is and does and how it works.
          ‘70 TR-6

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          • #23
            I always like reading Jim's posts. I feel like I learn something every time.
            I can't remember ever seeing that scuttle ground used in a car. Although I'll bet $ to donuts Greg's one has it...
            I'm really not that interesting...

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            • #24
              Originally posted by Neddie Seagoon View Post
              Here’s an article describing what the vs is and does and how it works.
              Holy cow, what a primitive device — then again, our cars are sort of primitive anyway. I am still pondering exactly what may be happening, but quite obviously the gauges which show this slow increase donhave the VS in common. Getting at it isn’t easy.

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              Headlights cause temp reading increase....

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