214 T680 blinkers not working in headlight assembly.

2014 t680. Just recently happened. All blinkers work except the ones in headlight assembly. Bulbs and fuses look good. Anyone know where the harness runs to for power and ground or anything that would help figure this out. Do possibly have a ground problem as sometimes at night I see the blinkers on side of fender by headlight lightly illuminate when interior cab lights are on and when the cab lights go out it will stop, and one or two of my gauge lights will dim down sometimes. Thanks in advance.

 

Thanks. I quickly figured that much out but Im curious as to where it goes for power, such as the firewall or somewhere else. Where does it feed from?