Your right about the 5AS. But curious that Marlinturbo has used the donor loom. Will have to pick his brains!!!
How are the other relays connected to the Marlin loom??? Not lloked yet. Maybe be able to connect up the relays using some bits from
www.maplin.co.uk?? You should be able to connect them up using some spade connectors or sockets from here depending on what type of relays they are.