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Thread: quick question about cigarette lighter + and -

  1. #1
    Constant Bitrate
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    quick question about cigarette lighter + and -

    im hard wiring the cigarette lighter to the car and i need to know what is + and -. There is a prong on the front and i think its + and the 2 prongs on the sides are ground. Also, when wiring it, what size fuse should i run inline??? its for the lilliput touchscreen btw

  2. #2
    Maximum Bitrate jusatry's Avatar
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    the lilli draws 8 watts and that is at 12 volts. A X V = W shows that the lilli shouldt draw more than .75 amps, so a 1 amp fuse ought to be fine. as for the polarity, the tip is pos the sides are neg, yes.

  3. #3
    Confusion Master
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    Polarity on a cigarette lighter varies from manufacturer to manufacturer

  4. #4
    Low Bitrate Dr Jeckyl's Avatar
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    get a multimeter. They start at about $9.99 and are needed for electrical installs. Set your dial to the nearest setting above 12V and check the wires with your probes. Red is pos and black is neg. If you get a negative reading (ie. -12.4V) then the test probes are on the wrong wires.

    I believe all cig lighters are wired the same, allowing the positive charge to enter the center coil first.

  5. #5
    Maximum Bitrate jusatry's Avatar
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    let me re-phrase: on my lilliput the center probe was posotive and outer area was the GND

  6. #6
    Constant Bitrate
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    thanks

  7. #7
    Newbie
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    It might be worth getting a DC-DC converter as the power coming from your cigarette lighter is likely to spike and dip when you crank your engine. Your screen is a bit more expensive than a 1.5Amp DC-DC plug in adaptor (I bought 2 from Radio Shack for about $10 each) and so putting one between your car and screen might save some damage. Just my opinion of course.
    As long as the car is negative ground then the tip of the cigarette lighter will be + and the shroud will be -
    Epia M10000, 256Mb RAM, 60Gb HDD, DVD-RW, External 120Gb HDD, Travla C134 case, Liliput 7" Touchscreen, GPS, 802.11, Bluetooth, FM Tuner.

  8. #8
    Maximum Bitrate jusatry's Avatar
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    didnt your lilli come with a regulator? (the grey egg) That oughta save the screen sufficciently unless the voltage spikes to 15-16 volts @ crank.

  9. #9
    Constant Bitrate blustreak's Avatar
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    I have a question? What happens if you blew up your "grey egg"? I cut the cig lighter adapter off and hooked up the 2 wires and the grey egg made a loud popping sound and started smoking

    What do I do now?

  10. #10
    FLAC samc's Avatar
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    then its toast, use a female molex connector and use that off your psu.
    Yellow is 12v+
    adjacent black is ground
    Mine needs to be updated.

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