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  • Brake light issue

    Electrical idiot here. My situation: both brake lights work when running lights are NOT on. Both running lights work when brakes are NOT on. When running lights are on and brakes applied, passenger side rear goes dark. Suggestions for a starting point here. Many thanks...

  • #2
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    Your solutions can be found in this book.
    Available from TRF, and others.
    It will pay for itself many times over.
    Walt
    CC80954U '72 TR6 original condition/sold 16.500.
    poolboy rebuilt the Z-S Carbs. Philstr6 rebuilt both rear hubs.

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    • #3
      That’s a good book but basically the issue is grounds. Make sure all your grounds back there are clean and tight.
      I72 Pimento w/overdrive

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      • #4
        The first place I would suspect in those circumstances is the ground tab on the RH taillight frame. See if it has a black ground wire attached.

        Taillight frame ground tab

        You might also find my Ground Point pictorial helpful.

        TR6 Ground Points.pdf

        You might also check the Cabin ground point and if your car has it, the Additional ground point shown on the last page.

        Last edited by RatRidgeRoadster; 02-10-2019, 09:11 PM.
        R3
        Jim Herter Copperas Cove, TX
        Original Owner ֍ 1970 TR6 ֎ CC 50990 LO
        VDU 506H

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        • ahoch
          ahoch commented
          Editing a comment
          thank you much Jim, very helpful. That pdf is superb!

      • #5
        The electrons move slower in old British cars. The wiring is undersized, and their aren't enough electrons moving to the back of the car to light both brake lights, or the brake lights AND the indicator lights. The driver's side (left in the USA) gets the electrons first and uses all or most of them up, leaving very few electrons to light up the passenger side lights. The number one cause of this is bad grounds. You have all the classic symptoms. Clean the bulb sockets too. I fitted extra ground wires to the rear lamps. Some have converted to LEDs, which require fewer electrons.
        My favorite spare part I conveyed to the new owner of my car was an old bottle of Lucas Replacment Wiring Harness Smoke. See if you can pick some up so if the smoke ever leaks out of your harness you can replace it.

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        Brake light issue

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