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LED side marker lamps

Discussion in 'Electronic Basics' started by [email protected], Feb 22, 2007.

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  1. Guest

    Hi all, I am replacing the old bulb type side marker lamps on my
    trailer with the new LED ones. I purchased a tridon 2 pin solid state
    flasher to replace the old one. My problem is that now the new LED
    lights stay on and do not flash. Help!
    Thanks in advance
     
  2. What is the amps draw of the lamps? What is the amps rating of the flasher?


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  3. john jardine

    john jardine Guest

    You must put a power resistor (maybe 10Watt) in shunt with the new bulb so
    the resistor + LEDs takes the same power as the old bulb.
    If you think you've problems then talk to the poor 'ole truck manufacturers
    who use computer controlled CAN bus polling systems programmed only to
    detect incandescent bulb failures.
    john
     
  4. Rich Grise

    Rich Grise Guest

    I've heard of a "Heavy Duty" flasher that doesn't depend on the load
    current to give it its flash rate. This is the kind that will still
    flash if you lose one of the bulbs (i.e., front or rear), albeit
    probably slower, so you'll know you have a bulb out.

    Good Luck!
    Rich
     
  5. The phrase I remember from an owner's manual is "variable-load flasher."
    They were originally designed for vehicles with trailers.
     
  6. James Beck

    James Beck Guest

    I know the local auto parts dealer has a "Heavy Duty Electronic
    Flasher" that uses a timer and a relay to set the flash rate, not a
    bimetallic strip.


    Jim
     
  7. john jardine

    john jardine Guest

    The primitive, electromechanical, bimettalic strip flashers are dead simple,
    cost nothing, last for ever and have built in bulb failure indication.
    Difficult to emulate using modern technology. The number of homebrew
    transistorised versions I've seen is legion. In not one of them, have the
    authors figured a way to provide useful bulb fail alarm. (or even recognised
    it came as a standard feature of the mechanical versions).
    john
     
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