My 2008 Sprinter passenger van came with the factory pre-wire for the reversing camera. I've been to Dodge dealers, online and to several shops: no one knows what camera was intended to be connected to the wiring provided, or how the wires are routed. The wires and connectors do not resemble anything the local installers have seen before; they want to rip it out and start over. (There also appears to be an antenna cable included in the harness.) Where can I get a wiring diagram of this factory installation and a spec on a camera that will connect?