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Brake lights turn off, when either blinker is turned on!

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  • Brake lights turn off, when either blinker is turned on!

    Basically, the title says it all.

    If you activate the brake lights and they light up, then turn on either blinker, both brake lights go out.

    Can't imagine this is correct, but I've made assumptions before and been incorrect.

    So, i'm sure the correct way is brake light on, turn signal for left turned on, brake light goes out on left side and becomes blinker, while the right side stays bright. For the age of technology, is this correct?

    Then, steps to troubleshoot if anybody has been down this road before. I figure its the blinker, and the contacts are doing something funky.

  • #2
    It should work as you describe. It sounds like dirty contacts in your turn signal switch. I would try moving the shift lever up and down a few times to see if it fixes it. If not you'll probably have to take it out and do a visual inspection. I would also check under the steering column and make sure all the connectors are tight and not corroded.

    John
    John Pizzi - Squarebirds Administrator

    Thunderbird Registry #36223
    jopizz@verizon.net 856-779-9695

    http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

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    • #3
      Connections are tight, John. Remember, turn signals interrupt brake lights. He has a bad turn signal switch plate. I haven't seen his but I can imagine too much current messed up the switch.

      The good news is, I'm sure many of our vendors carry that switch.

      Hey, when you pull the old switch out, attach a pull wire. It will make the new installation easy. - Dave
      My latest project:
      CLICK HERE to see my custom hydraulic roller 390 FE build.

      "We've got to pause and ask ourselves: How much clean air do we need?"
      --Lee Iacocca

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      • #4
        My '66 has the motorized sequential turn signal module. It's like a child's music box. I took mine apart to repair it. The mechanism can get rusty over time such that the relays don't make good contact.

        Take off the metal cover by bending back the tabs, clean the unit, re-solder any loose wires or cracked solder joints, light oil any movable parts.

        When reassembling, seal the metal cover with RTV to keep out moisture. When reinstalling make sure there's a good ground to the body.

        Hope that helps.

        Cheers,
        Richard, '66 Thunderbird Hardtop, 390FE, Edelbrock Al heads, Comp cam, Street Demon 650 carb. Visit my restoration blog at hwythunder.com.

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        • #5
          Brian has a '64 so he doesn't have the sequential lights.

          John
          John Pizzi - Squarebirds Administrator

          Thunderbird Registry #36223
          jopizz@verizon.net 856-779-9695

          http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

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          • #6
            Correct, that its a 64. No sequential turn signals. I also agree all the connectors and wires would be good, due to they work independent of each other. So, that leads me back to the common area, turn signal switch area.

            Now on to bad turn signal switch plate. Quick google looks like a wire harness and mechanism .

            https://www.larrystbird.com/wp-conte.../B-13341D1.jpg

            Is this the device you speak of?

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            • #7
              And thanks for the quick response and helpful ideas. Its appreciated.

              Side note: i have a buddy looking for a 60s comet or falcon, in decent shape and together. So, if u have any leads it would be appreciated.

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              • #8
                So, I'm back to this problem, didn't get a chance to pull the turn signal switch and see if that's the problem.
                The relay behind the washer bag, seems to also have power from headlights and tail lights running through it. I can hear it click and the brake lights light up,
                Since i haven't reviewed the schematic yet for that circuit, would that relay have an impact on the lights lighting up or not.
                Found out the horn relay wasn't working, so now i was trying to figure out how that relay worked, got most of it with a test light, but the last prong couldn't figure out what made it light up.
                Trying to do the curly shuffle and get it all working to go on the power tour road trip.

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                • #9
                  And if i turn the flashers on only the right side brakes lights work.

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                  • #10
                    Originally posted by pollolittle View Post
                    The relay behind the washer bag, seems to also have power from headlights and tail lights running through it. I can hear it click and the brake lights light up,
                    Since i haven't reviewed the schematic yet for that circuit, would that relay have an impact on the lights lighting up or not.
                    The brake light relay was added later in the '64 production run. Ford issued a TSB to add the relay to early cars that did not have it. I haven't found a schematic for it but if your brake lights are working it's most likely not the relay that is causing your issue. I would still suspect the switch.

                    John
                    John Pizzi - Squarebirds Administrator

                    Thunderbird Registry #36223
                    jopizz@verizon.net 856-779-9695

                    http://www.squarebirds.org/picture_gallery/TechnicalResourceLibrary/trl.htm

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