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The 2500's should already have the wiring harness under the overhead console
They DO ???
Are you sure about that ???
If its an '06 your talking about, nope, there is no wiring harness. It actually comes with the light kit. You laso have to run the wire down the pillar connect in to the IPC. It is really easy though. As a side note, when you have to run the wire through the firewall, i ran it through the same hole as the hood release cable goes. Using a little wire, it was a nice tight fit.
These trucks last a long time. Does anyone have any info on whether they will have rust problems ten years down the line. I live in a place that rains alot and that is what is stopping me from getting them.