Rivage electrics and one connection at the rear of the fuse box is a puzzle

Hi all

I am busy with the family Rivage while on "home leave"

Its had a couple of weird things happening following a flat battery that led me to looking for bad grounds in the dash area

First up the fuel pump relay played up and then the roof electrics did the same, roof now fine but i suspect low battery voltage together with a bad ground made the fuel pump relay unhappy

Anyway i have it all back together but while the fuse box was loose i suspect a spade connector came off the back and i dont know where it should go

Any ideas its a single spade and the cable is blue/grey ?

Many thanks

Cheers Guy