Would a Zener Diode work?

Discussion in 'The Projects Forum' started by IDriveaford, May 23, 2010.

  1. IDriveaford

    Thread Starter New Member

    May 20, 2010
    I have two circuits. One is a High Water Temperature circuit to turn on a light/LED at a desired temp, and the other is a Low Fuel level circuit to turn on a light/LED to indicate low fuel.

    When I turn the Ignition to start, I want the lights to both come on as a test. Problem is that if I tie these lights up to the (start) circuit, they will both come on, but if i have a fault (high water temp or low fuel) they will both come on. Would placement of a Zener diode on one of the light leads (before it is stripped into the start circuit) resolve my problem?
  2. SgtWookie


    Jul 17, 2007
    Probably not.

    Zener diodes might have similar voltage ratings, but different current ratings before they will give their rated Zener voltage. They are not all equal.

    If you wire up stuff at random to your vehicles' electrical system, you will have random problems.