I recently had U-haul add their standard trailer hitch and 4-way/7-way adapter electrical kit to my '06 Armada. when no lights worked then I added three relays to the relay fuse box under the hood: two aftermarket blue relays for right and left trailer turn signals and a brown relay where it says Trailer Tow Power No.2
Now the turn signals work fine on the trailer and so do brake lights. But the running lights don't work.
I believe so,this is a small harness wrapped in black tape either attached or running alongside the coulmn maybe a couple inches away?You are looking for 2 red mini fuses.Sorry I don't know if the Armada is the same