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  • Cold Cathode Help

    I have my cold cathodes hook up and they work, but i would like to know how to make them turn on when i put the key into acc, like when the radio turns on and all that. Would i just wire the power wire into another wire? Ya i need a little help.
    2009 Altima 2.5S CVT Dark Slate

  • #2
    Cold Cathods require 12V stable, so you can't just hook them up to any 12V wire. I too have a coupe of those in my car. They are powered from the PSU, and they turn on when I open the trunk. Just power them from the PSU, so if your computer is remoted to the ignition, they'll start with the ignition.
    Renault Megane...the OEM look

    The Lost in Europe Ford Escort

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    • #3
      I actually don't even have a computer in my car yet, too ghetto for that. I just have them wired to the car batterie, so if i can run a separte line from the +12v and then hook a switch up to that, i just don't know where to hook up that wire too.
      2009 Altima 2.5S CVT Dark Slate

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      • #4
        What he's saying is that the 12v+ from your battery is UNSTABLE. It doesn't always stay at 12v. It changes as you accerelate, and over time as the abttery died. You need a filter/regulator.

        If you're fine running a cold cathode from an UNREGULATER source, then just hook it up to the ACC wire going to your stereo (usually yellow and i nthe pwoer connection harness), and the other end to ground. Turns on/off with your key. I don't know what the repercussions of using an unregulated voltage on cold cathode is, but it can't be good.

        You could get some sort of 12v regulators, but you'd have to ask around here. I'm no good with that.

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        • #5
          Alright, I don't know how well they are gonna survive over an extended length of time, BUT CCFL tubes do not need a very regulated supply. I have been testing running my tubes off of a PWM signal, and they have been responding nicely.

          HOWEVER, I have only been doing it for a short time, and I do not know how long they can survive under these considerably harsh conditions.

          But here is how you would regulate it:

          Accessory line +12v ---> Regulator ---> +12v on the CCFL
          Ground---------------------^---------------^

          You would have to check the power requirement of the tubes first. Mine run at around 5 watts (a little under 1/2 amp.) Make sure the regulator is rated for higher than this. And most cheap regulators (7812 etc.) require something like 13.X volts in order to run at 12 volts, so they are not going to survive crank.
          2000 Subaru OBS

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          • #6
            well i have everything regulated on the cold cathodes. So i will read this thread a lil more when all these kids aren't here talkin so damn much.
            2009 Altima 2.5S CVT Dark Slate

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            • #7
              ok, i think i got it now. So i want to take power from the +12v line that is going into my stereo right? Aha, so ya, that should work. Ok i'll let you all know how it goes, thanks for all the help.
              2009 Altima 2.5S CVT Dark Slate

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              • #8
                Depending on where you live, and where you have the cold cathodes, you might want to check state laws to see if they are legal. I have 15 in my Jeep, all inside and under seats, they are only legal in my city for show only. I have my wired to a little rocker switch I have by my right leg. Thats wired straight to the battery, its nice having it hidden and easy access incase any cops are around.
                Jeep Grand Cherokee Laredo
                Kenwood X790 x/ iP500 Ipod Interface
                Elemental Designs 13Kv.2 D2
                CDT ES-620 (omg yayay!!!1)
                NINe.2X, NINe.2

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                • #9
                  Originally posted by HHdesign
                  Depending on where you live, and where you have the cold cathodes, you might want to check state laws to see if they are legal. I have 15 in my Jeep, all inside and under seats, they are only legal in my city for show only. I have my wired to a little rocker switch I have by my right leg. Thats wired straight to the battery, its nice having it hidden and easy access incase any cops are around.

                  15??? You've got to post a picture of that.
                  Renault Megane...the OEM look

                  The Lost in Europe Ford Escort

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                  • #10
                    Um, I live in Cali, Right near SF, so i don't really know. Ya, i have a switch hooked up too.
                    2009 Altima 2.5S CVT Dark Slate

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                    • #11
                      Originally posted by Cris
                      15??? You've got to post a picture of that.
                      there in his sig. Pretty nice job by the way.
                      2009 Altima 2.5S CVT Dark Slate

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                      • #12
                        Originally posted by Cris
                        15??? You've got to post a picture of that.
                        The link in my sig should get you there, but since those pics I have installed reds, and replaced a couple of RGB's. ...and thanks ClubFed
                        Jeep Grand Cherokee Laredo
                        Kenwood X790 x/ iP500 Ipod Interface
                        Elemental Designs 13Kv.2 D2
                        CDT ES-620 (omg yayay!!!1)
                        NINe.2X, NINe.2

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                        • #13
                          Ok, i've rewired everything and put the regulator on, it seems that it is getting hot pretty fast, i might just put it in a lil project box with a heatsink and some thermal paste.
                          Also, they can turn on at anytime still. I don't know why, i hooked up the power and ground cables to the stereos. When the key is not in, they still turn on, using the switch, so i don't know what to do. lil help please, thx a lot
                          2009 Altima 2.5S CVT Dark Slate

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                          • #14
                            Sounds like it wired right to the battery and not to anything that would regulate its power flow.
                            Jeep Grand Cherokee Laredo
                            Kenwood X790 x/ iP500 Ipod Interface
                            Elemental Designs 13Kv.2 D2
                            CDT ES-620 (omg yayay!!!1)
                            NINe.2X, NINe.2

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                            • #15
                              Well i hooked it up to the yellow wire coming from the stereo, should i do anything else?
                              This is how is wired it Stereo-Regulator-on/off switch-inverter-cathodes.
                              Heres a crappy diagram if it helps.
                              Attached Files
                              2009 Altima 2.5S CVT Dark Slate

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