I have (finally!) installed and finished my goal of installing 2013 Laramie (chrome) LED tail lights on my 2012 Laramie. Due to the LEDs not being compatible with all Rams 2012 and older, this required a special harness to be created in order to make the 2013 tails plug and play on older Rams.
For those unfamiliar with this project, I followed the instructions found
here.
I tried to keep these harnesses as clean as possible since just because there is enough room to cram all the wires behind the tail light, doesn't mean you
have to cram them in.

I am also a neat freak with severe OCD so, yeah. There you have it.
This is the harness with connections made and before tapping the resistor in (pardon the masking tape labels, it was a simple method for me to know which wire was which at a glance - it gets confusing and I got tired of referring to the instructions over and over to re-orientate myself with the plugs)
Resistor added
Reverse plug added and all connections heat shrinked and insulated
It is suggested/mentioned in the instructions to use aluminum plates to mount the resistors to, however a wise man (Arth) once told me that doing so would kind of defeat the purpose of this project being plug-and-play and I agreed. So, my resistors are stuffed to the bottom of the space behind the tail lights and I zip-tied the wires up top. There is a slight concern that I will have a rattle sound from the resistors striking the inner wall. I will have to drive some to see if this is an issue, but I am about 75% positive that this will not be a problem (and even if they do rattle, I doubt I will be able to hear them and they won't cause any damage where they are).
I absolutely love the side marker LEDs. I honestly hadn't noticed this feature on 13s and was pleasantly surprised to see them illuminate.
These suckers are flipping BRIGHT! I had a fleeting thought that these could be borderline illegal - but then it dawned on me that, duh!, these are OEM on 2013+ so I don't have anything to worry about. But, DAMN! Hello illumination! :SHOCKED: Needless to say, there is no way anyone will ever question what my truck is doing or about to do with all the exterior lights I have now!
PICTURE TIME!! :w00t:
Running lights without flash
Running lights with flash (gotta love how that chrome shines, even at night!)
Left profile to show Big Rigs and side tail light markers
Right profile to show Big Rigs and side tail light markers
Brake lights with flash (I tried without flash but my camera was flooded with the brightness and couldn't take a picture,
Reverse with flash
Reverse without flash