After some late night email dialogue with Rob to get details. I have put together this information on Rob's behalf to save time.
Wiring the R8247 Accessory Decoder side of the Relay board.
The best engineering solution in order to make connections between R8247 and relay board is to make up a wiring harness between the R8247 Accessory Decoder and the Relay board using industry standard DuPont 2.54mm Female Housing connectors. The currents on these input pins are very low, so only thin wires are needed which will aid the termination on the DuPont female terminals. Wire of 7/0.2mm size should suffice. The wires are best crimped onto the terminals using very small fine pointed tipped long nose pliers. It is fiddly, but can be done with care and practice. I have done loads myself, as I make extensive use of these DuPont connectors.
Two housings are required. A 9 way housing [1*9] for the relay inputs and a 3 way housing [1*3] for the +5 volt DC power supply.
These housings and female terminating pins can be purchased here. Be careful if you source the DuPont housings elsewhere, as normally you have to buy the crimp terminals separately. The linked eBay seller includes the crimps in the listing.
The harness is made up as per the graphic below.
The output [relay contacts] side of the relay board are wired up as per the schematic below: