Update 4-26-2016: We have since suffered sort of a crash and cannot recover the photos below. Instead, we're going to just post a picture that we just took from our Mac Mini stored on our shelf.
Hope this helps, as we recently received a email asking for wiring details.
Warning: The following steps are to be performed by those competent in soldering and electronics. The following step WILL very likely VOID your warranty. We will also take NO responsibility for any damages that you might incur.
Ok, so here’s how we did it, however we don’t like re-inventing the wheel (rather then to improve on it) we going to refer you to ifixit.com on disassembly first.
http://www.ifixit.com/Teardown/Mac-Mini-Model-A1347-Teardown/3094/1
Please do steps 1-14, and 22. Then come back here.
After you have disassembled your Mac mini, remove the power supply and re-assemble everything like so. Reconnect the power supply on the outside of the Mac Mini.
1) Cut the positive wires, and the Negative wires. Note the Middle wire:
2) Solder Pos wires together, and solder Neg wires together.
3) Find a wire and solder to it to make leads longer:
4) Solder the other end of the wire to a Panel mount DC jack:
5) Run it to the back of the Mac Mini where the AC cable used to plug in:
6) Find a Car cig plug (we
sell them) and solder it to a 2.1mm plug:
7) Here’s how it looks fully assembled.
8) Plug in to the Mac Mini and you’re done!
NOTE: We tested with operating voltages of 10v all the way up to 15vdc, however we STRONGLY recommend you use a voltage regulator. Please contact us.
For those who don’t want to do this yourselves, please go
here
Mikegyver.com