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SPST Lighted Rocker Switch is not Lighting Up

Discussion in 'Electronic Basics' started by Eddie, Oct 8, 2005.

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  1. Eddie

    Eddie Guest

    I just bought the following SPST lighted rocker switch from RadioShack but I
    can't get it to light up:

    This is a 3 terminal switch (power, load, ground) and so far as I know, I
    have everything hooked up correctly. Power is coming directly from a
    switched 10A fuse in my Jeep's fuse block. The switch activates the solenoid
    I have it hooked up to just fine but the light in the switch will not come
    on when activated.

    I have hooked up two different switches I had laying around (one
    incandescent and one LED) and both worked and lit up just fine. I have
    purchased a second identical switch and tried it out just in case the one I
    had a bad bulb but it didn't work either. Based on what I have read, but I
    think the bulb might be neon? If so, is there something special I need to
    do to get this thing to work correctly?

    I apologize if this sounds like a really stupid question but I really know
    very little about electronics and I'm at the end of what I can figure out on
    my own. I really would appreciate any help you can provide. Thanks!

  2. Andrew Holme

    Andrew Holme Guest

    It sounds like it's intended for mains votlage. Neons fire at about 90V,
    and your jeep's electrical system is only 12V.
  3. Richard

    Richard Guest


    Spec shows this switch is rated at 10A 125 VAC. The key here may be that it
    is designed for AC, not DC, voltage.

  4. Rich Grise

    Rich Grise Guest

    No apology necessary - this is the basics group, after all. :) The
    only stupid question is the one you don't ask.

    And yes, it's because that particular switch has a neon bulb, which
    needs mains voltage to operate. So, the short answer is, yes, you
    _could_ make it light off 12V, but it's so not worth it that most
    people wouldn't even say it's _possible_. ;-) (you'd have to build
    a little 120V power supply, which is possible, but - OK, I'll say
    it: _THAT_ would be stupid. :) )

    If it's hackable, you could open it up and replace the neon and the
    120K with an LED and, say, 470R, but for three bucks, just go get
    one that has an LED. The rest of the specs are fine.

  5. Jasen Betts

    Jasen Betts Guest

    You need over 70 volts to light that one up. It's a neon illuminated switch.

    Complain to them that their online description doesn't mention this clearly
    (it doesn't it only mentions the resistor for the neon)

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