Truck Rear Wiring 101 | Ram Engineering | Ram Trucks 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 v..Author: Ram TrucksViews: 50K tail light harness wire color code | DODGE RAM FORUM I found a color code diagram on the web for 2008 Rams a few years ago. However, when I opened-up the wire harness in the tail, the color code diagram was not even remotely close to the wire colors I was looking at in my hand. Thus, I scraped the idea of trying to rely on diagrams and used a prick light tester instead. Tail light wire diagram | DODGE RAM FORUM Tail light wire diagram. Jump to Latest Follow 1 - 5 I'm working g on a project and need to know what color wire does what. I guess I could go with a test light, We’re the ultimate Dodge RAM forum to talk about the RAM 1500, 2500 and 3500 including the Cummins powered models. Need Tail light wiring diagram for 2006 Dodge Ram 1500 Need Tail light wiring diagram for 2006 Dodge Ram 1500. Mechanic's Assistant: Okay, I'll connect you to the mechanic to see about that diagram for your Dodge Ram 1500. Before I do, is there anything else you want him to know?