Thanks foggymind :thumbup:
Yes that is correct some are unused,
My original bus was, +12, +5, A, B, Gnd, Reset. +12 is used for the cockpit fans.
But for the front cockpit I increased the bus to 10 lanes with extra GND and +5V lines interleaved between A and B. I also dropped the reset line, I've never had to use it. The original only allowed me to run 5-6 modules per bus. The new one has allowed me 12 and-counting without issue.
cheers
John