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Thread: Questions about running cable, also powering questions

  1. #1
    Constant Bitrate
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    Post Questions about running cable, also powering questions

    I'm ready to start running cable for my car and have a couple of questions. I have a couple cables running up, would you reccomend putting them all into one piece of flexible tube? Will any of the cable become disfunctional because of people stepping on it?

    Alright. For the power, I was originally just going to run an extension of the cigarette lighter to the trunk. I noticed that I have a lamp in my trunk about a foot away from where I'm going to put the PC. I just burned out the fuse for that lamp and saw that it was 15 amps. Well the lamp is only turned on when the trunk is open and theres a switch right on the lens to turn it on or off when the trunk is open. Can I just run the power safely from this to my inverter? In theory it seems like it will work but I don't want to over power the lamp or in that sake the fuses and battery. Thanks a LOT! Your answers contribute to a nice project!

    -Kev

  2. #2
    FLAC
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    the wires running to the lamp probably can't carry the current needed to power an inverter.

    as for the cables, running them in one flexible tube should be fine.

    BoB

  3. #3
    Maximum Bitrate
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    Just run a 4-8 guage wire from the battery, (cig lighter or lamp will not work) there should be plastic strips running between your door and carpet, unscrew them and run the wire under them. Usually you can run the wire behind the back seats through holes already made. Connect the cable to your inverter, then ground the inverter to your car chassis (unpainted) with the same guage wire. Then you are all set!
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  4. #4
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    4 - 8 gauge is probably a bit overkill for this application.. I use 10 gauge to my inverter (Until I get my Arise) and 8 gauge to my amp. All's well. I did plug the PC in to a Watt's Up load meter, and it's only pulling like 40 watts of AC.. probably not taxing the the 10 gauge at all.
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  5. #5
    Retired Admin Aaron Cake's Avatar
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    I wouldn't reccommend running the computer from the light. It may not connect directly to the battery/igniton switch. If it runs through the dimmer switch or something, you will cause quite a few problems.

    And 4-8 AWG wire is insanely large for running an inverter. 10 or 12AWG is more than sufficient. Of course, if you are planning to put amps in the trunk, then running that large wire might not be a bad idea...
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  6. #6
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    I reccomended the 4-8 guage because the draw from the battery when the car is started. A thicker guage wire will help the inverter maintain the current needed to run the computer when the car is started.
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  7. #7
    Variable Bitrate
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    The size of the cable has nothing to do with supplying enough current while the car is starting....the starter puts a tremendous drain on the battery. The power cable won't be able to draw any more current than the battery can supply regardless of its size.

    Catlas

  8. #8
    Retired Admin Aaron Cake's Avatar
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    Originally posted by Maveric:
    <STRONG>I reccomended the 4-8 guage because the draw from the battery when the car is started. A thicker guage wire will help the inverter maintain the current needed to run the computer when the car is started.</STRONG>
    I thought that we've already covered this. The size of cable has nothing to do with keeping the inverter running when the car is started. If the battery voltage drops below the cut off voltage of the inverter (due to a bad battery, bad connection, etc.) then larger cable will have no effect.
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  9. #9
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    Just run a 4-8 guage wire from the battery, (cig lighter or lamp will not work)
    Why would 12V cigarette socket not work? I am about to install my computer in the trunk, and I wil planning on running the inverter (Portawatz 150) to the cigarette socket (since the plug is designed to go into a cigarette lighter socket).
    I am fortunate in that the cigarette socket in my car is only active when the ignition is on, so this is a perfect solution for me.

  10. #10
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    You can not run the power from your Cig Lighter because it does not have thick enough wires going to your battery. and MTMSOL, yours probably goes throught a relay, which is nowhere near the specs that you need to carry the current.
    Just get some 6 gauge wire at a hardware store, run it to your battery, and be done with it, no big deal.

    And to turn you Inverter on and off, get inside it, splice into the wires running to the on switch, and run them to a switch on your dash.
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