Wiring help for sequential turn signal running board LED

2014 Toyota Tacoma Prerunner sr5 2wd 4cyl

Does anyone know which wires I can splice into for running board lights? There are three connections: sequential turn signal, running lights, and dome light. I want to connect them inside the cab just inside the door under the dash, which I already ran the cable into the cable through the grommet under the seat. Thanks!

these are the connectors I want to splice the wires into if someone could point out with harness I can put my test light on each pin or something

 

I tried to decipher the schematics in the following link, but I really don't know how to read the mumbo jumbo. If anyone can help determine which bundle or harness I can tap into for the lights or how to read the schematic, I would be very appreciative.

https://www.tacomaworld.com/threads/2015-wiring.559639/#post-18289852

 

Stupid question but why cat you just tap all the wires into your trailer hitch wiring? Just get a Y 7 pin connector pigtail and wire in the running board light strips into it? All the wiring can be contained outside the vehicle without getting crazy running wires.