A few years ago I bought a LokSound Select decoder including the motherboard that was lifted from an F3. I emailed Bill Serratelli and asked him if he could provide a schematic of the pinouts for the motherboard.
I have some extra harnesses/connectors from 3-rail engines in addition to those provided with DC locomotives. I modified the 9-pin connector to use in the Lighting 1 socket. The only socket that I wired directly to the pins was Lighting 3.
I reprogrammed my decoder since I placed it in an RS-1.