Help wiring an illuminated automotive toggle switch - please.

Discussion in 'The Projects Forum' started by bajafx4, Nov 26, 2008.

  1. bajafx4

    Thread Starter New Member

    Nov 26, 2008
    Last edited: Feb 12, 2010
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    Use a SPDT switch. When the contacts to power the ABS function are open, then the other contact turns on a bulb or LED.
  3. Polomolokolo

    New Member

    Nov 26, 2008
    Hi Rich

    Don't be surprised if the switch isn't what you want.

    These Carling switches come in a multitude of versions - unless you have the full manufacturer's part number, there's no way of telling for sure. (In the unlikely event you have the 14-digit number, post it, we can look it up.)

    You just have to beep out the switch yourself. Use a multimeter to identify which contact does what; a 9V battery will get the LED lit enough to see it on.

    On-off-on isn't a terminology I understand but it sounds like this is a latching SPST switch which illuminates when on.
    This would not be a SPDT as Beenthere suggests you use. A SPDT would do the job fine as he says, no relay required.
    It's likely that Carling have wired this switch so that it shows ON when the contact is CLOSED, which would be the most common application - and the opposite to what you want.