I just bought a new to me 2021 F150. I went to plug in a 4 pin trailer light and was surprised when I saw this below the 7 pin connector. I've never seen this connector. Anyone know what it is?

 

its for the yaw sensor for the pro trailer setup
the 7 pin should have an adapter lug that goes from 7 to 4 flat. previous owner might have kept it or look in glovebox maybe

 

The ford 4 way adapter is junk and doesn't work. Had to buy a uhaul one. That works perfectly

 

Will the optional trailer camera also connect to that plug?

 

newer trucks should be wired for it but you would have to replace the small harness at the back for the 21 and early 22 to work. For some reason for only wired it for the sensor originally. But that harness is small and a quick replacement.