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Why are car alarm starter relay normally closed?

Discussion in 'Electronic Basics' started by Sam Nickaby, Feb 11, 2006.

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  1. Sam Nickaby

    Sam Nickaby Guest

    Why are car alarm starter kill relay designed to be normally closed? It
    would make practical sense to make the relay normally open because
    when the crooks pull the alarm fuse or the alarm unit out of the car, the
    car shouldn't be able to start. But in fact it's the opposite and crooks
    knows about this. What are the reasons for alarm companies for
    making there relay normally open?

  2. Steve Mackie

    Steve Mackie Guest

    Why are car alarm starter kill relay designed to be normally closed? It
    My Alpine SEC-8049 can operate the starter interrupt relay in either N/C or
    N/O operation.
  3. dnoyeB

    dnoyeB Guest

    So they are not liable when the alarm fails and prevents you from
    starting your car and you freeze to death in the mountains. My alarm
    broke, and all I had to do was unplug it, and im off.

    Other way is better for anti-theft and in fact current design makes
    aftermarket kill switches virtually pointless.

    Thank you,

    "Then said I, Wisdom [is] better than strength: nevertheless the poor
    man's wisdom [is] despised, and his words are not heard." Ecclesiastes 9:16
  4. So that if the alarm unit fails, you can still drive your car.
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