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Thread: Disconnect battery while engine is running?

  1. #1
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    Disconnect battery while engine is running?

    I have an idea which is similar to home security system.

    A person enters the car turns on the ignition which turns on the carputer. Within a time frame that person has to enter a security code to disable a program which triggers the alarm. Further, the program would disconnect the battery and alternator via a relay switch rendering the car inoperable. The program would then take a snapshot of the driver via a webcam, dial into an ISP upload the picture and location of the car, then notify the owner that the alarm has been triggered.

    First question:
    While the car is running, disconnecting the battery and alternator would that kill the engine???

    Q2. Would it be possible to have a sensor which track movement? If the car is towed the sensor would trigger the carputer to turn on which then go through the identification process.

    Q3. Is there a third party program which takes the co-ordinates from the GPS and saves it as text?

  2. #2
    FLA gospeed.racer's Avatar
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    Quote Originally Posted by l4tran

    First question:
    While the car is running, disconnecting the battery and alternator would that kill the engine???
    Not always, depends on the car.

    Quote Originally Posted by l4tran

    Q2. Would it be possible to have a sensor which track movement? If the car is towed the sensor would trigger the carputer to turn on which then go through the identification process.
    Your speed sensors would do the trick, just need to interpret their signal.
    2005 Ford Focus ST

  3. #3
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    Quote Originally Posted by gospeed.racer
    Your speed sensors would do the trick, just need to interpret their signal.
    that wouldnt work if you car got towed away tho. since you dont spin the wheels do tow a Front wheel drive car.

  4. #4
    cheap custom title JC-S60's Avatar
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    I wouldn't disconnect the alternator and batt, just cut off the ignition...

  5. #5
    cheap custom title JC-S60's Avatar
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    and you can use any sensors used in a normal car-alarm system... just hook'em up via some input (serial, parallel, usb etc)...

  6. #6
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    Yea, no need to tap alternator when you can just cutthe ignititon via a relay. Another system, is to just cut the Fuel Pump. If the engine won't get the fuel, it'll also cut out and stop running.

    But remember this also A real theif woh is experienced will go to all extremes. If he can't jack it, he'll destroy it. And further, if he really wants it, tow bed truck and off the car goes.

  7. #7
    Top Ramen lgbr's Avatar
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    A lot of car alarms come with an ignition cut off relay. This will cut the ignition off, not allowing things like the fuel pumps, injectors, and spark plugs to operate.

    Another thing people do is cut off the fuel pump's power.
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  8. #8
    Maximum Bitrate MoFo's Avatar
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    Hmm...is there anyway to stop the ol' tow truck?

  9. #9
    Top Ramen lgbr's Avatar
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    Quote Originally Posted by MoFo
    Hmm...is there anyway to stop the ol' tow truck?
    My only answer to this is hydraulics. I know that over here and over in Montana, thieves will put a car on a flatbed truck, and drive to Seattle to deal with it.

    I'm sure a lot of you have seen show cars. A lot of them look so low that you can't drive them. Well, that's what the hydraulics help with. The car is lowered to the point where it rests on its chassis, and when you want to drive, it rises up. It becomes nearly impossible to put on a flatbed or any kind of tow truck at that point.

    And for us FWD people, use your e-brake, and leave it in gear!
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  10. #10
    Raw Wave rando's Avatar
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    You could always keep your computer running at all times ... off a hidden tank battery perhaps. You could set it up to wirelessly forward it's location to you at all times. If they take it, you'll know where it is. It's basically the Lo-Jack premise. If lots of people started to do this, thieves would just as quickly come up with a counter measure.

    Ultimately, your best protection (if you want it) is to buy insurance against theft. Then pray like hell if they do take it that it's not found before your Insurance pays the total loss.

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