electrical connections

[gps350se]

Hi Folks

I am at the point in my rebuild were i am putting back the bits someone else took apart and i may have hit a snagg.
I have just put back the right hand fuel tank and have put the wiring back but the wiring from the panel with the relays in seems to have 4 large connectors and i seem to have 5 in the tank well have i got something missing or is one not used.

Thanks Gavin.