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Indicator switch

Last post 07-28-2009, 4:15 AM by davey. 3 replies.
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  •  07-21-2009, 4:58 PM 20339

    Indicator switch

    My indicator lights worked intermittently and now have ceased operating all together.  I thought initially it was humidity as it was during a dry spell that they resumed working.  Now nothing.  Could it be the relay, the switch or something worse?  Is there a tendency with these that I should look for first?  It's a 1978 Spitfire.
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  •  07-22-2009, 3:49 AM 20345 in reply to 20339

    Re: Indicator switch

    Do you mean your turn signal indicators on the dash?
    On their death bed, nobody ever said, "Gee I wish I'd spent more time at work!"

    '68 Sprite 1275
    '76 Midget 1500
  •  07-27-2009, 10:25 AM 20430 in reply to 20345

    Re: Indicator switch

    Yes, my turn signals.  I discovered over the weekend that, by turning on my hazards, that my right rear side lamp is not lighting.  could it be that having one out disrupts the circuit?  I am ging to replace the bulb and see if that solves the problem.
  •  07-28-2009, 4:15 AM 20436 in reply to 20430

    Re: Indicator switch

    I'm sure that it will.

    The flasher requires a specific current (about 1 ampere) through it in order to flash correctly. The current heats up the reed contact which is actually made of two different metals laminated together. With added heat, they expand at different rates. This action causes the contact to bend away from its mating contact, thus breaking the connection. Since current stops at this point, the reed contact cools and bends back, thus restoring the circuit and current flow. Having done this of course, the contact begins to heat up and the cycle continues. 

     


    On their death bed, nobody ever said, "Gee I wish I'd spent more time at work!"

    '68 Sprite 1275
    '76 Midget 1500