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Fluttering LED's at Front signals

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  • Fluttering LED's at Front signals

    I have a little mystery to resolve: I've have installed LED's on my front signal lights and there are great when I have the running lights and headlights off. when I have either the running lights or headlights on and use the turn signal, both turn signals (left and right) with flutter with the intended signal being brighter. Its is the fluttering that is a bit confusing to other drivers. Where is he going?? I have resistors installed on both sides and have grounded both sides to the same metal radiator shrowd. Maybe there is trickle from one side to the other??
    But then I disconnected one side and grounded it to something else and still the flutter, but only when the running lights or headlights are on. Any ideas??

  • #2
    Did you try taking out the LEDs and putting regular bulbs back in?

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    • #3
      Might need a diode somewhere...
      '74 TR6 CF13007U aka "Mr. T"
      Custom Blue (Delft-Like) and New Tan (Formerly Mallard and New Tan)
      Points, Ballast Bypassed, Bosch Blue Coil, Moss Cobalt Wires, Champion RN12YC plugs.
      Peaks and tweaks, but the spirit of Original
      Redlines always.
      My wife is the Driver, I'm just the Mechanic....

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      • #4
        Take the turn signal indicator out of the circuit. Look under the dash to find where the TS switch plugs into the harness. The TS indicator light grounds out through the "un-selected" side...really. In the Moss motors LED conversion video, they call it sympathetic blinking.
        If your "Not-selected" lights stop blinking, then you either need to install diodes, or change to a flasher that has three blades: Switched, Load, and Pilot.
        If pulling the bulb doesn't help, then you have other wiring issues that must be dealt with...including a potentially "electrically dirty" turn signal switch. Let us know how this turns out.

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        • #5
          I replaced he LED's with the old bulbs and there's no sympathetic blinking. The flasher is the old two blade model and I did buy a three blade model with the LED's. But I only have two wires for the three blade flasher. I tried different combinations with no joy. What do I do with the third blade??

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          • #6
            Do us a favor and create a signature that includes the year of your car. All too often a response can be model year specific.... especially electrical questions
            1975 Mimosa with a few upgrades/mods:
            Patton TBI
            HVDA Toyota 5 speed
            Goodparts Nissan Diff
            Goodparts CVJs
            AAW Wire Harness
            Miata Seats
            Boyd Welding Custom 15 gallon aluminum gas tank

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            • #7
              The car is a 1973 TR6 with no upgrades other than the LED's. I did some checking on the 3 blade flasher unit that came with the LED package and have located the "input" which I guess must connect to the lead from the battery, the "load", which must be the connection to the lights. So what does the "pilot" connect to?? There is also a ground wire. Model Grote 44890.

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              • #8
                When I put LED’s in my car, I put a ballast on both left and right turn signal circuits. IIRC this was supposed to solve the sympathetic flashing of the other side.

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                Fluttering LED's at Front signals

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