Seems like your issue is common. I googled "oem brake controller cable 2012 ram" and found some info. Basically, your missing the CAN Bus+, CAN Bus- and the switched +12VDC. The CAN bus is so that the controller can communicate to the truck and thus display on the EVIC if the truck is flashed for the brake controller. The CAN bus is not needed for the OEM brake controller to work. So if you can look around and find the missing plug to the OEM brake controller you can make your own cable. Supposedly many have done this. If you don't care about the EVIC, then just add the +12 VDC to the connector or find another way to wire it to the controller.
Last edited by Pedro Dog; 05-16-2013 at 05:11 PM.