Hmmmmm, well this Stu bloke obviously knows what hes on about, but if you look at a Ford wiring diagram for an RS Turbo, it would seem this is wrong.

The RS loom, for all the running gear, can be removed in one piece, (say you wanted to convert another car), and the only physical connections that run into the fuse box IIRC are 6 wires, only 1 of which actually physically connects to the fuse box (and thats for a Series 2 only as they have the KE Over Voltage protection module)

I cant really comment on what Stu has said, but from having wired up my own car i can tell you enrichment has nothing to do with this socket. To back up my point, look at the contacts in that space, theres 5 slots, and i bet you only 2 of which have pins in them (common + and - Busbars which run to all the relay sockets), now by all means if your feeling brave try bridging them together, but i think you know what happens when you put a piece of wire between a + and - terminal.