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Thread: Cigarette Lighter is always ON

  1. #1
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    Angry Cigarette Lighter is always ON

    I own a 2004 volkswagon golf and i just put a carputer and alpine amp, speakers..etc.... I have a cigarette lighter in the back of the trunk and i was planning on hooking up some external devices with a power inverter back there.. i want to hook up an external hard drive and maybe a playstation... the problem is whenever anything is plugged in, the device is on all the time... for example i plugged in my cell phone car charger and took the key out and locked the car... the LED was still on. i dont want to always go back in the trunk and pull the plug and if i dont my car battery might get drained. I was wondering if there was a way of making the cigarette lighter act as an open switch when the key is out of the igition without rewiring, that anyone know of. i just put everything back 2gether and dont feel like opening it for a while. if you have any questions about my installation i would be glad to answer them. i learned alot from just reading forums so i recommend that to any one trying to an installation like this. this is my first post but have been reading forums about carputers for a while.

  2. #2
    My Village Called 0l33l's Avatar
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    Well, you'd have to rewire the cigarette lighter. I personally wouldn't use a cigarette lighter to power a large inverter.

  3. #3
    Maximum Bitrate eCarô's Avatar
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    Most, or maybe all, cars built for the US will have power to the cig lighter(s) all the time.

    Strangely, I rented a couple VWs (a Gol and a Polo) in Brazil, and the cig lighters only worked when the car was running. But, the radio was powered all the time.

  4. #4
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    You will need to rewire and make sure that one side of the lead that goes to the cigarette lighter (that is if you still planning on using that- I wouldnt either "as stated above" -hard wire it man) is only hot when the ignition switch is on. Probe out the leads under the dash and find one that is 12 volts hot only when the key is turned to the on postion or the start position.

    Do it the right way! Add an inline fuse as well. Much better than torching your ride -for sure!

  5. #5
    My Village Called 0l33l's Avatar
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    Quote Originally Posted by eCarô
    Most, or maybe all, cars built for the US will have power to the cig lighter(s) all the time.

    Strangely, I rented a couple VWs (a Gol and a Polo) in Brazil, and the cig lighters only worked when the car was running. But, the radio was powered all the time.
    Sentras only give power to their cig lighters when the key is on the AC or ACC position. But then again they aren't real cars.

  6. #6
    Maximum Bitrate eCarô's Avatar
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    Quote Originally Posted by 0l33l
    Sentras only give power to their cig lighters when the key is on the AC or ACC position. But then again they aren't real cars.
    Well, at least they don't leave power to the radio all the time, do they?

    I was leaving the radio on for weeks before I figured it out. The hotel I was in had valet parking, so the valet was always turning it off, I guess. And when I showed up at the plant I was working at, I was just turning the volume down so I could talk to the guard at the gate. I was leaving it on the entire day, just with no volume.

  7. #7
    My Village Called 0l33l's Avatar
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    Quote Originally Posted by eCarô
    Well, at least they don't leave power to the radio all the time, do they?

    I was leaving the radio on for weeks before I figured it out. The hotel I was in had valet parking, so the valet was always turning it off, I guess. And when I showed up at the plant I was working at, I was just turning the volume down so I could talk to the guard at the gate. I was leaving it on the entire day, just with no volume.
    Nope, the radio stays off when no keys are in the ignition.

  8. #8
    Raw Wave shotgunefx's Avatar
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    If it's in your trunk it's probably considered a 12v acc socket. They are always on. My car has two 12v sockets, one for a lighter (only powered with key) and one that's always powered for running accessories.

    I just mounted my laptop in the trunk. I ran a 12v accessory socket back there. It's trivial to do. Depending on the amperage, you could just use one of those "addacircuit" fuses and plug it into a port that's only on when the key is in. They can only handle around 10amps. That's what I did.

  9. #9
    Maximum Bitrate shizzle's Avatar
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    Quote Originally Posted by shotgunefx
    If it's in your trunk it's probably considered a 12v acc socket. They are always on. My car has two 12v sockets, one for a lighter (only powered with key) and one that's always powered for running accessories.
    My accord doesnt have a lighter, but it does have a 12v 10A plug (nonsmoking edition). It is only powered when the key is turned, but it does something weird. When I have something plugged into it the radio stays on for ten seconds after I turn the key off. The plug no longer has power, I know this for sure cause whatever is plugged in cuts off, but the stereo stays on for ten seconds. If I pull the plug in those 10 sec, the stereo cuts off.
    Carputer status: [-*---------]
    Im thinking laptop...

  10. #10
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    Sometimes a burned fuse (mine was the 15A of radio), changes the default behavior of Cigaret Lighter or Radio-CD. So e.g. Radio stays allways on, when this fuse is burned.

    Check your fuses if you are not sure that this is the default behavior of your car.

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