Mark there are wiring schematics that cover all trads from 2014 to end of production within the parts book. Unfortunately they were deleted by MMC after version 6.0. This early version can be downloaded
here though.
If you scroll down past actual part number listings there are many wiring diagrams and schematics. Those that cover individual elements of the Roadsters electrics can often give insight to your +4 as well, as that used a similar BCU. The +4 chassis loom schematic is probably the most helpful though with far less errors than those covering earlier Duratec cars. Individual wires within looms are not shown but each end is labelled with a unique identifier which includes it's colour(s). Also multiple connection points for sharing power/signal (bomb tails) are shown with their relative position within loom.
