'70 Turn signal switch assembly for NON Tilt column wanted
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Thread: '70 Turn signal switch assembly for NON Tilt column wanted

  1. #1

    '70 Turn signal switch assembly for NON Tilt column wanted

    Anyone got a clean used one out there? Narrowed down all my brake light issues to the switch. All the aftermarket ones have bad reviews......

  2. #2
    Join Date
    Mar 2002
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    Dallas, Tx
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    62
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    10,956

    Re: '70 Turn signal switch assembly for NON Tilt column wanted

    It's way too much work to install a used switch that may or may not work, and will probably fail soon because it was installed 50 years ago. Spend money on a real one and then it will likely last your lifetime. Ths is a job that takes several hours, the price for a real NOS Ford switch is not bad. https://www.ebay.com/itm/1970-1971-1...QAAOSwFp5cw3Eq
    Royce Peterson
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  3. #3
    Join Date
    May 2011
    Location
    Albuquerque NM
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    63

    Re: '70 Turn signal switch assembly for NON Tilt column wanted

    I spent a great deal of time in late 2017-early 2018 testing several improvement iterations of the Drake D2AZ-13341-C switch. First, I measured the static resistance through the switch. Then I measured the temperature at various rivet locations to understand how the switches fail. Simultaneously, I measured the voltage drop across the switch under load and calculated the resistance. I also measured the same points on an NOS Ford switch built in the early 1990's.The NOS switch resistance was well below .1 ohms. The Drake switch measured from .3 to .9 ohms.

    I discovered that the voltage drop caused by the excess resistance was overheating the steel rivets at the green, blue, orange/blue, and green/orange wires. The rivet temperatures exceeded the melting point of the plastic housing on the original Drake switch. This is why the old Drake switches failed. They were marginal in a Mustang and not viable in a Cougar.

    The manufacturer revised the switch with thicker wires, brass rivets, higher temperature plastic, and improved the material for the brake "W" contact bar.
    The goal was to reduce the resistance through the switch and reduce the heating generated.

    The old version would release the "magic" smoke in about 45 seconds. The final version of the revised switch was tested successfully for over 10 minutes with full brake lamp current.

    Note: It is a good idea to operate the switch 10 times in each direction to clear the grease from the internal contacts.

    My recommendation is to measure any new switch from the green to the orange/blue and green/orange wire - it should be near or below to .1 ohms.
    Also measure from the blue to the orange/blue in the Right turn position and then blue to the green/orange wire in the Left turn position.

    However, the best solution is to convert to LED bulbs and reduce the current through the switch (by a factor of 7!).
    Vic Yarberry
    Cougars Unlimited LLC
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  5. #4

    Re: '70 Turn signal switch assembly for NON Tilt column wanted

    Thank you but It appears I missed the auction! I even have that saved in my Ebay search for reminders and that never came up. I guess it sold immediately. If you know of another please let me know!

  6. #5
    Join Date
    Sep 2013
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    ND USA
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    56
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    Re: '70 Turn signal switch assembly for NON Tilt column wanted


  7. #6
    Join Date
    Aug 2019
    Location
    buffalo, new york
    Posts
    1

    Re: '70 Turn signal switch assembly for NON Tilt column wanted

    what did you end up going with ?

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