If I remember correctly, all of the wires are yellow and white...one color for power (12 v), the other is your ground. To determine which wire is for a particular light, you will need to "ring" them out...( disconnect one wire from the harness and connect a piece of wire long enough to reach the rear of the trailer and test each component with a multimeter set to "continuity "... when it gives a tone, you found it...label the wire and try the next one...can also be done in reverse...component to harness...2 people make it easier...hope this helps
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2204T
2902Bx
2807C
2015 Ram 1500 EcoDiesel
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