Technical X250 fuse box cable

[plwsm]

Hello all,
I took off the fuse box cover on my 2016 X250 motorhome to look at a fuse and I noticed that one of the cables on the main input terminal was not secured to the terminal post. There was no nut securing the terminal to the post as can be seen in the attached photo.
The motorhome is only a couple of months old (66 reg) and it looks as though the nut was never fitted. I cannot say that I have noticed anything not working or intermittent, but there is a lot to check and I may have missed something.
I have now secured it with a M6 nylock nut but does anyone know where this particular cable goes to and what could be the likely problems if it came loose?

Thanks
Phil

 

[rayc]

The big terminal is for the positive jump start cable. My guess is that the small wire is not a Fiat original connector/ion. Something the MH converter or dealer has added for an accessory?