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Help with switches for ignition circuit

Discussion in 'General Electronics Discussion' started by b-rad_76, Dec 15, 2009.

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  1. b-rad_76


    Dec 15, 2009

    [image in next post (hopefully)]

    I am trying to design a circuit to enable a push start button in my car.

    It is easy enough to wire the push button to start the car (see my weird diagram) The problem is, the standard ignition switch disables pin 2 while it is at position 3.

    With my setup the ignition switch is set to position 2 and then the momentary switch (purple) connects pin 4, 5 and 1 when depressed (as a substitute to position 3 on the ignition switch). But in turn, pin 2 is not disabled while the momentary switch is depressed.

    Is there a way to disable pin 2 with the ignition switch at position 2 while the momentary switch is depressed?

    PS FYI pin 2 is disabled while position 3 is activated to reduce current draw by accessories.

    Thank you in advance,
  2. b-rad_76


    Dec 15, 2009
  3. Resqueline


    Jul 31, 2009
    Sure, by removing the wire from pin 2, connecting it to the NC contact of a changeover relay (SPDT contacts), and then wire pin 2 to the COM contact of the relay. Then I'd wire the NO relay contact to pin 4&5. The coil is then controlled by the pushbutton, saving it from having to carry the 16-40 amps flowing into the starter.
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