I found a cheap Xbox Power Supply that is rated at 14.2A so I tried to modify it, after I noticed that it's not so easy to open it up (whitout brute force :) ) I tried a different approach, I noticed the XT60 connectors fit exactly in the interior of the xbox connector so I was thinking maybe I could fit an ON/OFF switch also. It worked and it came out to be a clean mod.
What you need
1. Xbox power supply (link)
2. XT60 connectors (link)
3. ON / OFF switch (the smallest you can find with correct AMP rating)
4. Short silicone wires 14AWG (for 12v line) and 18AWG (for 5v line) I chosed silicone wires because they are very flexible
5. 2 diodes
6. Soldering Gun / Iron
7. Flat screw driver
Step 1: What You Need
Cut the interior of the connector so you can insert the XT60 connectors
The blue wire should be soldered to the diode.
The 3 yellow wires should be all soldered to the 14AWG red wire and the black wires on the negative wire going to XT60 connector, on the black wires solder another 18AWG wire if you want to have 2 x XT60 connectors like I did, one for 12v and one for 5v