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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Thanks for sharing Jordan 2929, particularly the info on the white wire w/ tan tracer! A couple of additional comments on the install:
1. A set of fairly inexpensive plastic body tools makes the trim and wire tray top cover removal easier
2. I have a quad cab and suspect the shorter wire tray is more difficult to work with than the Crew Cab but if you work the top cover carefully you can get the back section to pop out from under the rear seat support trim then work back to front to remove. Reinstall the same way back to front - again plastic trim tools were a big help here.
3. I installed a light kit from Amazon (
https://www.amazon.com/gp/product/B07PGKQLC2/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1) and ran the wires for each side thru some existing bed fabrication slots just behind the fwd stake holes and then down. There is a support channel across the front of the bed that makes a good chase for bringing the passenger side wires over to a drivers side connection point.
4. Most kits come with a single pole single throw on/off switch (SPST) which will allow you to turn the bed lights completely off - if you want that capabilty. If you want to include it, run a pair of wires aft along drivers side frame and come up the rear bed pillar to the plastic insert that comes in place of factory bed lights. Pop it out and cut the insert with razor knife to fit the switch. Wire it up, snap in the switch then the insert and you have a handy, clean looking install. My recommendation is to buy an aftermarket waterproof single pole double throw (SPDT) switch (on/off/on), run a power feed from the trailer hitch 12 volt power conductor (always on) to the third terminal on the switch. This provides ability to turn the bed lights on independent of the cargo light, off completely, or leave them slaved to the cargo light.
5. I used waterproof crimp connectors or solder joints with heat shrink covers for all wire connections and stepped the wire size up to 16 ga. for all added wire that wasn't part of the kit. The routing underneath is a bit tedious but along with the cross support channel there are enough harness and tubing runs to piggyback your wiring to. Be generous with the tie wraps to avoid wire movement /abrasion and wrapping with electrical tape will protect wire to sheet metal intersections.