Seatalk set up

The system

newest digital radar
autopilot pump and actuater switch av 100
gps
fishfinder
monitor c series

It came as part kit Included ev1 backbone kit
I installed the spur adapter with split wires to av100
does this power the backbone?? The book says no?
I also hooked up the red /black spur power wire to backbone. Is this redundant?
Thanks for your help
aloha