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I have that same plug on my 23 2500 HO Cummins. I also have an extra plug behind the 12.1" screen. I don't have the factory AUX switches or upfitter also. I'll take a pic of the one behind the screen later tonight.
@Florotory I picked up my 2023 this past weekend and it didn't come with the Aux switches. If you still have a wiring harness available I would like to see about getting one. I'm ordering the switch bank now and the relays and fuses. Let me know if you have another one available. Thanks, Tim