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Easiest way to tap a 12V accessory line

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  • Easiest way to tap a 12V accessory line

    So I'm down to the last portions of my car computer project. I'm just hiding wires now more or less. So here’s my problem.

    Right now I'm running all my equipment off the cigarette lighter. I would like to run the screen and the GPS of a 12V accessory line somewhere that I can hide all the wires. What is the easiest way of doing this? I really don't want to take my car apart any more then absolutely necessary, as I don't really have any experience taking apart car interiors (my approach to hiding things so far has been to say “hmm. I can stuff wires up under this!”).

    Any Thoughts?
    A digital mind lost in an analog world.

    Learn to ask smart questions!
    http://www.catb.org/~esr/faqs/smart-questions.html

    My car PC: The Lost Cause!

  • #2
    Im guessing that you drive one of the big three since you said "I'm running all my equipment off the cigarette lighter" The easiest way to get acc is at the fuse block for most American cars. It would help to know what kind of car you drive, year, make, model, trim level.
    NEW complete and updated My project with 100+ pics on 7-4-03
    If you have a Shuttle FV24 motherboard in perfect working condition for sale, please PM me.

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    • #3
      fluffy- Running everything from the cigarette lighter... How's that holding up?

      I'm at the same point. I don't want anything shorting out.

      cproaudio- I would also like to know how to connect my LCD to the acc wire.
      I drive a 1995 Nissan 240sx

      thx
      -Rob
      95' 240sx craving boost
      .....and a carputer

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      • #4
        I'm driving a 93 honda accord SE. I've been running the LCD, Garmin GPS 35, and laptop charger off the Cig lighter for some time now. I'm not close to the 10 amps I would need to blow the thing with that. Untill I got the garmin GPS I had a 70 watt inverter powering a USB hub in there and THAT put it close the the maximum amperage, but I never blew a fuse. I'm damn glad to get rid of that inverter, It made so much noise in my stereo system.

        I have not made any aftermarket modifications to it save a new head unit and my car computer.
        A digital mind lost in an analog world.

        Learn to ask smart questions!
        http://www.catb.org/~esr/faqs/smart-questions.html

        My car PC: The Lost Cause!

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        • #5
          ohh I read the question wrong. Thats why I thought you drive an american car. For Most Hondas you can find the ACC terminal on the top of the fuse block in the kick panel.
          r2o4b0sx, for the 240SX, you can catch the ACC on the back of the cig lighter. The radio/shifter bezel is all once piece and pulls easily. Start at the bottom of the shifter and pull your way up. Once you pull it off you can access the cig lighter wire.
          NEW complete and updated My project with 100+ pics on 7-4-03
          If you have a Shuttle FV24 motherboard in perfect working condition for sale, please PM me.

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          • #6
            Heres what i did in my 98 Civic , i ran down to Autozone and bought a tapping fuse, got back to the house, consulted my owners manual for the accessory fuse, pulled the fuse out, loaded it and the appropriate fuse to protect my carputer and just plugged it back into the original slot. No messy tapping, and it doesnt void your warrenty
            2007 Honda Fit Sport 1.5L SOHC-VTEC

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            • #7
              Originally posted by binary.h4x
              Heres what i did in my 98 Civic , i ran down to Autozone and bought a tapping fuse, got back to the house, consulted my owners manual for the accessory fuse, pulled the fuse out, loaded it and the appropriate fuse to protect my carputer and just plugged it back into the original slot. No messy tapping, and it doesnt void your warrenty
              That sounds like a very good idea. I'm perfectly comforable pulling cable with a cable snake. What gauge wire should I use?
              A digital mind lost in an analog world.

              Learn to ask smart questions!
              http://www.catb.org/~esr/faqs/smart-questions.html

              My car PC: The Lost Cause!

              Comment


              • #8
                I did that too .. I used fuse taps to power my lights, carputer trigger, dvd player.. screen. It works very well. And about that hiding cables?...just grab your manual and learn how to take the panels apart . First time it took me forever to figure it out. Now I can take apart my entire car and put it back together with no problems.
                Mine needs to be updated.

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                • #9
                  I recommend for a number of reasons that you put a tap (with fuse) on the battery post.

                  And run that to power your accessories.

                  Now if you want it set up so that the Ignition Switch kills the power, then get a BIG relay...similar to one that drives a starter solenoid. And let the relay do the work.

                  Your ignition switch was not designed to have a lot of juice running through it...you will probably see shortened life span.

                  The relay doesn't pull much power, but it can handle a much larger load on the working end.

                  Most cars have an accessory spot on the relay panel or what have you, or find some accessory (like the radio) that only works when the key is on, and tap that power...that is how I wired my radar detector in the overhead console.
                  current projects

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                  • #10
                    I agree with DodgeCummins on this one. just as a rule of thumb automakers put in fuses and wire gauges that are a little over than what they need and really shouldnt be pushed more than that.
                    Originally posted by menudude
                    thank you all for your help minus the useless post by sjlucky...

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                    • #11
                      I bought a litte device at auto zone today called an add a circut, It allows you to add a new, seperately fused circut without having to do any wiring.

                      The first fuse is for the original attachment and the second is for your accesory.



                      What do you people think of it? I plan to run it off the cigarett lighter line, as I never use it for anything other then the car computer.
                      A digital mind lost in an analog world.

                      Learn to ask smart questions!
                      http://www.catb.org/~esr/faqs/smart-questions.html

                      My car PC: The Lost Cause!

                      Comment


                      • #12
                        Originally posted by fluffy2097
                        I bought a litte device at auto zone today called an add a circut, It allows you to add a new, seperately fused circut without having to do any wiring.

                        The first fuse is for the original attachment and the second is for your accesory.



                        What do you people think of it? I plan to run it off the cigarett lighter line, as I never use it for anything other then the car computer.
                        That device looks cool. I'll get that to run a line to my shutdown controller.
                        SP13000|M2-ATX|512MB DDR400|2.5" 7200RPM S-ATA|Trans-7"|Slim SL DVD-CDRW|KEH 5.1 DSP|SB L!ve Ext|Gyration PowerMate|BT|WiFi|GPS|WinXP|VoomPC
                        GPSing - Digital Speedo
                        Relocating headunit and extending faceplate
                        Button app to Alt-Tab between two programs

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                        • #13
                          http://www.biltema.se/products/produ...?iItemId=42906
                          or
                          http://www.biltema.se/products/produ...?iItemId=42902
                          -
                          My cars
                          -

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                          • #14
                            That was the item that caused reboots and loose connections in my last CarPC.

                            I'd rather just shave some sheilding off with a knife, wrap the wire around and apply some solder and then wrap nicely. Much cheaper and you won't have a loose connection 4 sure.
                            SP13000|M2-ATX|512MB DDR400|2.5" 7200RPM S-ATA|Trans-7"|Slim SL DVD-CDRW|KEH 5.1 DSP|SB L!ve Ext|Gyration PowerMate|BT|WiFi|GPS|WinXP|VoomPC
                            GPSing - Digital Speedo
                            Relocating headunit and extending faceplate
                            Button app to Alt-Tab between two programs

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                            • #15
                              You can also get a service manual for ur car at the Honda/Acura delear. Its like 35bucks. Its a must have for a do it urselfer, it shows everything, such as what each wire means in ur car. So u'll never be scared of opening stuff after looking at it. I think u can actually call in the order. I forgot the 1-800 number. Or check out honda-tech.com or hondahookup.com forums, U'll find more than enough
                              MY CAR PROFILE (@HONDA SHOWOFF)

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