I bought and installed these myself. I love these bed lights. They work well, they fit well and they just do exactly what they were designed to do. The wiring is wrapped in wire loom and it is very tough. The hardware included mated just fine with my hole in my bed. Even though I have a spray in bedliner, no problem at all. I have a 2017 Ram 2500 SLT, 6'4" bed. My truck didn't come with these bed lights, obviously, but what my truck did come with is the wiring to basically drop the wire that is directly connected to the light heads down inside the bed and plug them in. I didn't have to run the wiring from my fusebox or internal switch. That was a really big perk. What I did have to do though is modify the computer to enable these to work. When you unlock the truck these lights come on. When you turn on the rear cargo light with the button on your light panel these lights come on. But you have to have the feature enabled in the computer. You can very easily do this yourself using software call AlphaOBD and a bluetooth OBDII dongle.

My 16' Ram had the plugs already ran under the back end of the truck. Simply plugged lights in and bolted them to the bed. Down side. You have to get the dealership to install a sales code (code LPL) and flash the computer to get the circuit open for the lights to work. First dealership I called was just under a hundred dollars to add sales code and flash the computer. Shop around dealerships charge different prices. Lights are bright and work well. There are other options on wiring the lights around the closed circuit. I wanted the truck wired to factory.

This product adds factory bed lighting to my 2018 2500 ram tradesman. Easy to install since the factory cut outs and wiring were already in place. Installed in less than an hour and it only took this long because I was taking my time and enjoying the time to work on my own truck.
The hidden cost was having to go to a dealer to have the option turned on in the truck computer so they worked with the installed factory wiring. I called 3 different dealers trying to find the best price, didn't matter apparently, I still had to pay for 1 hr of shop time so they could flash the computer.
With that said it was still worth the.money to me. Now I can see in the truck bed at night under my tonneau.

OEM quality is hard to beat. Rather than tie it into the fuse panel, which would have been very difficult to get at plus mine is a 2015 and I don't think it is programed for these lights, I tied it to the white/brown striped wire under my drivers door sill panel that leads to the bed light on the third brake lite. Ran the wires up between the driver side inner fender and cab and then through the rubber plug where the clutch master would mount if you had a standard transmission. you can punch the plug out, then drill the hole and run your wire through it and then put it back in. Beats trying to drill a hole under the dash or through the firewall and you can drill the hole a little small and it seals perfectly. Works great.

Picked these up to add LED bed lighting to my 2018 Ram 3500 Mega Cab. As others have stated, 2017+ are pre-wired for these. Install was literally 5 minutes. It took longer to boot my windows computer up and enable the "sales code" then to physically mount and wire them.
1. Install them in the openings.
2. Crawl under each rear corner of the truck and find the capped off wire. Remove the cover and plug it in.
3. Enable the "Truck Bed Lighting Feature" in AlfaOBD. Done.