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Am I about to make a mistake? Powering Carnetix

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  • Am I about to make a mistake? Powering Carnetix

    My plan was to run an 8 guage wire with a 15 amp fuse straight from my battery to the carnetix 1900. When I received the carnetix I noticed their connector is using 16 guage wiring.

    This leads me to believe the carnetix was designed to just run off a power cable inside your car?

    What do you guys recommend? Will I have any problems running straight from battery at 8 guage and then splice the wires to the carnetix down to 16 guage?

    Or should I just find a 12V battery tap inside my car and run it that way?

  • #2
    Originally posted by PatInTheHat View Post
    My plan was to run an 8 guage wire with a 15 amp fuse straight from my battery to the carnetix 1900. When I received the carnetix I noticed their connector is using 16 guage wiring.

    This leads me to believe the carnetix was designed to just run off a power cable inside your car?

    What do you guys recommend? Will I have any problems running straight from battery at 8 guage and then splice the wires to the carnetix down to 16 guage?

    Or should I just find a 12V battery tap inside my car and run it that way?
    You have connect the carnetix directly to the battery, but you can always run the 8 guage wire to a distribution block.

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    • #3
      I connected mine right to the radio harness, but I'm not really overloading the PS. I have minimal setup (1GHz epia, with flash drive, no hd, no cd, just the screen)
      EPIA TC 1G 256MB 60GB Linux,WindowMaker, Roadnav, Xine, XMMS, iGuidance3
      Lilliput 8", Pharos i360, WUSB11v2.6 WiFi

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      • #4
        Originally posted by PatInTheHat View Post
        My plan was to run an 8 guage wire with a 15 amp fuse straight from my battery to the carnetix 1900. When I received the carnetix I noticed their connector is using 16 guage wiring.

        This leads me to believe the carnetix was designed to just run off a power cable inside your car?
        I wouldn't do it. You're definitely on the right track with the 8awg cable. That might be overkill as far as the wire thickness, but it's certainly not going to hurt anything...

        Originally posted by dupa2 View Post
        I connected mine right to the radio harness, but I'm not really overloading the PS. I have minimal setup (1GHz epia, with flash drive, no hd, no cd, just the screen)
        While it may work for YOU, it's certainly not recommended if you want a safe installation.
        Have you looked in the FAQ yet?
        How about the Wiki?



        Under normal circumstances, a signature would go here.

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        • #5
          Alright im just going to find a way to splice the 8awg and the 16 together and continue as originally planned.

          Just to double check, is it perfectly ok to go from one guage to another? I also purchased 12 guage to run throughout my car and I noticed most cabling is 18guage+ and I will be having to make several splices.

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          • #6
            Yep u gonna have to find a connector to connect the two together. I myself use 8 gauge wire for my car pc. Just use a tapper to tap into the wires if you want to that what i do.

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            • #7
              i just took the 16ga and meshed it straight into the 8ga... it helps if you haven't already twisted or otherwise mangled the bare wire ends. Once they were together i just flooded the joint with solder and used heatshrink tubing around it. Worked like a charm.
              Et ipsa scientia potestas est.

              Worklog for my 2007 Civic Si ...f*** it...
              Pictures of the Corolla (retired)here
              Need to make something? Here are a few ideas.

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              • #8
                Perfect thanks guys. I may just do what you did GoHybrid, works for me.

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                • #9
                  I second GoHybrid's idea, thats what I did too.

                  Make sure to get electrical solder from radio shack the ones they carry melt failry easy. Ohh and be sure to put soldering flux/paste on your wires prior to soldering, it will make the soldering wires together MUCH easeir.
                  My Install

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                  • #10
                    Here's a nice little table that has some good recomendations for vehicle wiring:
                    Code:
                                    Length of run (in feet)
                        Current     0-4  4-7 7-10  10-13  13-16  16-19  19-22  22-28
                    
                          0-20A     14   12   12     10     10      8      8      8
                         20-35A     12   10    8      8      6      6      6      4
                         35-50A     10    8    8      6      6      4      4      4
                         50-65A      8    8    6      4      4      4      4      2
                         65-85A      6    6    4      4      2      2      2      0
                        85-105A      6    6    4      2      2      2      2      0
                       105-125A      4    4    4      2      2      0      0      0
                       125-150A      2    2    2      2      0      0      0     00
                    Generally it is not OK to splice a larger gauge to a smaller gauge without a fuse sized for the smaller gauge in between the splice, if the smaller gauge is on the load side. If the smaller gauge is on the supply side, then you want a fuse sized for the smaller gauge between the supply and the small gauge wire. Remember that fuses are there to protect your wiring from melting/burning so you always want to put a fuse in the circuit rated just below the maximum rated current of the smallest wire in the circuit.

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                    • #11
                      What my plan to do, is basically to use an amplifier wiring kit.....its perfect for what you need, and pretty cheap to, as it includes everything you need!

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                      • #12
                        Originally posted by BiG K View Post
                        What my plan to do, is basically to use an amplifier wiring kit.....its perfect for what you need, and pretty cheap to, as it includes everything you need!
                        yes, good idea. It's also a good idea to go with at least 4 gauge instead of 8 gauge. It will give you enough room in case you want to add a couple amplifiers along with the carputer.

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                        • #13
                          whenever reducing a wire size always fuse it to protect the wire from burning up.

                          So going from 8ga from battery to 16ga is fine as long as you use a fuse that will blow below the threshold of the wires burn point.

                          Dont just solder or couple a large to small wire. If something happens and that device starts trying to yank more power than the smaller wire can push then it will burn up. Very dangerous.

                          Sure most times your safe since alot of devices dont draw alot of power and never will, but theres always a chance, better to be safe than sorry. I'd rather use a 20cent fuse to protect something than risk damaging thousands of dollars worth of equipment and car.


                          Best bet is a fused distribution block. Which is what I use. 1/0ga cable from battery to fused distro block, then car pc has it's own fuse, harness plugs into the distro block.
                          Car : 00' Chrysler 300M
                          Speakers : Rainbow Audio SLC 265 | Subs : Diamond Audio D6 12" Subs X2
                          Amp's : Hifonics ZXi 6006 AB | Hifonics BXi 1606 D
                          CarPC: HP Laptop AMD Sempron 3000+ | 1.5GB RAM | DVD+RW | 80GB 5400RPM HD | ATI R200 Video

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                          • #14
                            Yeah, you can't have too many fuses I will have 4 gauge running to a distribution block with fuses, 8 gauge to the carnetix and 8 gauge to the amplifiers. Then an inline fuse on the the primary output to the computer and another fuse on the secondary output to the LCD. Oh, and a fuse on the 4 gauge near the battery. Fuse selection is also important. You want a fuse that is lower than the max the wire can handle (so it pops before the wire burns) and higher than the normal peak load (so it will only pop when a problem exists). The problem I have now(and why you need good wire) is some crappy 8 gauge wire I was given and thought I'd use it (it's mostly insulation and probably more like 12 gauge). Amplifiers on a good 8 gauge and turned off. Anyway, I'm getting a voltage drop under load with my carpc running of about 1.5+ volts front to back pulling about 5 amps...causing my P2140 to shutdown because it thinks I have a low battery (battery is fully charged). I adjusted the low battery shutdown for now.
                            CarPC in my 82 Camaro. Dual core atom, M4-ATX, 7 lilliput, bu353 GPS, Reborn skin, punch 40/100ix
                            MediaLaunch for RR
                            Online Check for RR
                            Locker for RR

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                            • #15
                              If for example im splicing from my ignition (unkown guage but different) to 12 guage for carnetix, should I fuse that? (and then again to carnetix uses 16 guage or something so it would change again ugh, another fuse?)

                              How about taping an power line thats powering something like a XM sat box again simliar situation? fuse fuse fuse every time I splice ?

                              How are you guys actually putting the fuse in between? I see radio shack sells fuse holders for $4-5 a pop but if I need like 10 of these its going to get messy ;(

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