My truck didn't come with the bed utility group so I missed out on the bed lights, which are very useful especially if you have a tonneau cover. So I found the wiring diagram and followed the wires from the third brake light down to the driver side rear kick plate, my plan was to tie into the wires suppling power to the cargo lamps which would turn on the led strips whenever the cargo light was on. I found the wire pretty easily (just a couple trim pieces to remove) it was a white wire with a tan tracer. From there its very simple, just install whatever light you want and ground one side to the body and connect the other side to the white and tan wire. And now you have bed lights for under $20. PS, If you run into an issue where the aftermarket lights don't work I recommend swapping the cargo lights mounted in the third brake light housing to LED, that has solved the issue for the couple of people it happened to. Here's a link to the set that I used.
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