Hi Don!
My bad, the connector is of course THK ( not T10K ) and it's pin 7 T10p, which is Black/Blue. I choose to get the signal from the T10d white cable because of space issues, but it's the same signal.
Regarding the Relay I have, it's just as a safety feature. The 20w (about 1.5 amp) would easily work without a relay, but I like relays 😜