Here's an update from myself, but also needing some help! I have been following this thread, as i was planning on installing a set of fog lights that also have a turn signal, as my new bumper almost completely blocks my headlight turnsignal
My truck is a 2020 1500, Bighorn base, with Vland aftermarket lights. I used the diagram posted about for the wht/tan and wht/grn at the headlight harness, and that was it. it worked lastnight perfectly after install, and then this morning I got a "front marker lights out" warning, and then even the factory headlight signal wasn't activating. After driving awhile, everything started working again, and then it stopped again
Im assuming that it's a signal issue, and am guessing i need to throw a resistor in somewhere, or maybe change a setting in AlfaOBD?