I'd get a 4-pin to 4-pin connector from the motherboard to the CC-M, do the required splices to add the 4-pin black Molex connector for track power and motor drive, and run pin 1 of J4 to the serial data. Get that working first before you look into adding any lighting, etc. driven by the CC-M.
Truthfully, I simply replace the 6-pin black Molex power connector with the correct 4-pin one, I hate splices where they don't have to be.
