Any idea where this goes?

[simbadog]

Just noticed a cable with plug dangling below dash on drivers side of 2021 Autosleeper on Peugeot chassis, it's a 4 female connector with 3 wires in, Red/Black, White & Red. Not noticed it before!

 

[pappajohn]

Probably a surplus wire.
One harness will fit many models and some won't have stuff others do so the 0lug is unused on that model

 

[Phill D]

It's quite common to have spare harness wiring under the dash.
I would guess it serves no purpose on your model / fit

 

[simbadog]

Thank you, possbly just dropped down then, everything seems to be working

 

[Winger]

Ejector seat perhaps