Truck Rear Wiring 101 | Ram Engineering | Ram Trucks - YouTube Click to view on Bing2:13Ram Trucks engineer Chris Borczon gives us a crash course on rear truck wiring for Ram pickups and Chassis Cabs. For upfit information not included in this video, please continue watching the RamAuthor: Ram TrucksViews: 50K I am in process of wiring up lights on a cm flatbed on my I am in process of wiring up lights on a cm flatbed on my 06 ram 3500 big horn I have seen so many wiring diagrams looks like my problem has been addressed several times. wiring an LED flatbed on a 2003 Dodge wiring harness. All Dodge Ram wiring diagrams avail here | DODGE RAM FORUM yup from what understand the 02-05 are the same. but i recommend you read and trace to double check any wiring color. i have used this same site over and over to work on electric tid bits here and there, like finding the correct wire to have my forglights come on with the parking lights, still keeping the option to run them with the high beams and turn them off if i desire. Dodge Ram Trailer Plug Wiring Diagram | Trailer Wiring Diagram Dodge Flatbed Wiring Diagrams – Data Wiring Diagram Schematic – Dodge Ram Trailer Plug Wiring Diagram by Bismillah. 5-Pin Connector; This 5-pin trailer wiring diagram is terrific for trailer which has big capacity. But, it does not have as sophisticated and electric intensive features that RV and other expensive trailers may have.