Thread: Carnetix Wiring Help Needed!

So worst case scenario... if I cant figure out whether or not my iSense is spliced correctly, would this be a plug and play solution? http://store.mp3car.com/MacPac_Power..._p/cbl-002.htm


I need to search for a wiring diagram for properly wiring all of this, I am just going off of what the previous owner had (he doesn't seem like he knows quite what he was doing).

Is it possible for you to post a picture of your jumper configuration?

Yeah, let me take it out of my car and ill take a pic and mark where I have everything going.

Ok here's what I got... For one it looks like I already have that macpac harness I linked earlier... correct me if im wrong.

Here's the p1900. Notice the wire(s) coming from the cage go to the front of the mac. I included a pic to show exact location. Not sure what this is for???



Just a pic of the label on the carnetix.



Here's a pic of what I believe to be the output harness. Not sure where the brown goes??? Also, is this the blue wire that i will be connecting to my amp? Like I said, it looks like I already have the mac harness.



Here's a pic of what I believe to be the input harness. Ok, this shows the 2 wires (red and black) that splice together to go to the connector on the back of the screen. I have the other red wire going to battery and... well you can see the rest from the pic. Not sure if I need to splice the blue wire into anything?



I noticed a screw was missing from the outside frame of the carnetix, and with the wire coming out of the cage, I assumed the previous owner opened it up. I did the same to find 2 connector unplugged as well as this small board just hanging loose??? Any suggestions/thoughts on this mess?





After all that... how does the wiring look? What could be contributing to my problem of not automatically starting the mac mini (starts fine when I press the actual power button)?

1. The red and black wires that go to your screen are wrong. The way it is connected right now it is not regulating the 12 volt power to the screen because it is connected on the input side before it ever gets to the P1900.

You should remove the splice and connect the screen wires to the OUTPUT side of the harness. +12 volts to the brown wire and ground to the black wire.

2. The little board inside is a Carnetix P5V 5 volt point of load power supply. That means you have 3 different voltages for your 1900. 18 for the mini, 12 for the screen as the secondary power, and 5v for a USB hub. The black wire coming out of the cage is likely the plug for a hub the guy you got it from had. The port you point to in the first pic is audio in and should not have power running in to it.

The LM2595T you circled in red is part of the 5volt regulator and should be secured to the side of the case for heatsink purposes. Find a small screw and bolt and secure it.

3. I haven't looked at the manual for the P5V but you can find it on Carnetix's website. It may explain what the green connector is. Or they may have been added by the previous owner as convenient 5 volt connectors.

4. We still need clear closeup pics of the jumpers to tell if you have them set correctly. Make sure the P5V is moved out of the way so we can see underneath it.

Just to clarify:

Input side is the 6Pin Plug with 2x Black, 2x Red, 1x Blue and 1x Yellow
They Perform the following functions:

RED: 12V Input. (Note, BOTH Red wires are connected internally on the PCB)
BLACK: Negative. (Note, BOTH Black wires are connected internally on the PCB)
YELLOW: Ignition Line (connected correctly in your pics)
BLUE: Pulse input as previously explained.

Output side is the 8Pin Plug with 2x Black, 1x Red, 1x Brown, 1x Blue, 1x iSense and 1x Green

They Perform the following functions:

RED: 18v Output for Macmini
BLACK: Negative OUTPUT. (Note, BOTH Black wires are connected internally on the PCB)
BLUE: DYNON/Amp signal
BROWN: 12v Secondary OUTPUT! (for powering screen)
iSENSE: Communication with Macmini
GREEN: Switch wire. This operates on a N/O contact. When the P1900 closes this contact, the mini will power on/off. Note: (the other switch wire is connected to ground.)

As BugByte said, Remove the P5V and take a picture of the jumpers.

Ok... so I will disconnect the currently spliced red and black wires that go to the screen. I will connect that screen plug to the brown and black wire on the output side. Correct?

In regards to the first pic of the carnetix and the plug that I have currently running to the front of the mac... those wires are red and black... where should they be going? Will I not have anything plugging into that port on the mac?

I was confused as to what the jumpers were... I know this will sound noob but are the jumpers below that loose piece in the carnetix you mentioned as being P5V? Are we talking specifically about the black and brown plugs that have pins coming from them directly below that board?

Thanks for all the help so far! I can't wait until I get this squared away!

Originally Posted by JETT86

Ok... so I will disconnect the currently spliced red and black wires that go to the screen. I will connect that screen plug to the brown and black wire on the output side. Correct?

Correct. As Lachie pointed out, BOTH red wires on the input side go to the same place. I think this is Carnetix's way of doubling the wire gauge so they can still use a molex connector. Because the red and black 'extra' wires go to the same place as the red and black power wires, electricity and ground is available on those wires, just like a jumper wire would work. That's why they act as an output and your screen is able to power up from those wires. They are actually power IN wires.

[I would actually take those two red and black wires and pigtail/connect them to the place your present red and black wires are connected. I've run it both ways (with them pig-tailed and without them hooked up to anything) and had good results either way so if you don't get what I'm saying, just disconnect them.]

In regards to the first pic of the carnetix and the plug that I have currently running to the front of the mac... those wires are red and black... where should they be going? Will I not have anything plugging into that port on the mac?

Maybe I'm confused. The picture you show is of the back of the Mac, not the front. The port that your red arrow points to is an audio input port, according to what I saw on the interweb.

I think that plug is for a USB hub. Again, test it with a multimeter and see if it outputs 5 volts. If it does, then it is a 5 volt plug. The Mac Mini does NOT need a 5 volt anything, so I think you are just confused about what that port is for.

I was confused as to what the jumpers were... I know this will sound noob but are the jumpers below that loose piece in the carnetix you mentioned as being P5V? Are we talking specifically about the black and brown plugs that have pins coming from them directly below that board?

Thanks for all the help so far! I can't wait until I get this squared away!

There are 6 locations on the P1900 board that there are jumpers. They are numbered JP1 through JP6. They look like little pins sticking up on the board and you 'jump' them with a piece of plastic that has a wire embedded in it. It is a teeny-tiny little rectangular piece of plastic. In your very last picture where it says "Hanging loose????" the red circle actually touches a set of pins that are NOT jumped. Right next to those pins is a jumper that IS jumping two of the pins.

To get the P1900 to work properly, you must set the jumpers to the right setting. The electronics inside the P1900 can read the location of the jumpers and will configure itself accordingly. We need a picture of ALL of the jumpers.

Where are the jumpers? Take a look at the P1900 manual on page 25 where it lists the location of jumpers JP1 through JP6 on the board itself. You need to read that diagram and section very carefully and ensure that the jumpers are set like you want them to be set. If you don't, you will damage the power supply, your screen, possibly your Mini or all of them. Use a pair of needle nose pliers to remove them or switch them around.

Here's what I have changed so far...

Brown wire now goes to the wire that was previously connected to red and black (went to screen) on the input side.

I removed the audio plug that went to the back of the mac mini that came from the red and black wires from inside the carnetix.

I took the red and black wires that previously spliced to my screen now splicing into the other red and black wires on the input side.

Here's some pics of the jumpers:






So do the red and black wires coming from the carnetix go to anything? And I dont need this plug for anything right? (even for getting music to my amp/speakers?)