Headlight wiring help

[burn88]

Just bought an 06 ram 1500. 3 wires coming from dash harness to connector I'm assuming 2 ground 1 hot.

In picture I'm not sure what the large black wire with the blue connector is? Is something aftermarket added or a stock wire fixed? Help please thanks

 

[Black-Wolf]

Are the headlights stock or aftermarket? Looks to me like someone either put in aftermarket (switching out HID for LED) or decided they wanted DRLs but couldn't figure out how to program the BCM (on my 2017, I just programed them in after the dealer gave me a hassle saying it couldn't be done, but everything I looked up online said it could). Here's the diagram for the 4th Gen, but chances are you can use it to help figure things out: