Right, the XR3i didn't have a motor in the boot for central locking when I bought it. So, I got one, with the wiring, from a friend yesterday. Came to fit it today, screws it in place, runs the wire down the rear quarter, up the sill, got told to splice into the passenger side wiring............................ however.

The passenger side looks like an aftermarket kit. Only a red and black wire, I have 3 wires on the ford loom from the boot.

WTF do I do from here???? Please help.