Follow up to what Forest just posted
we are in agreement on the blacks.
we are in agreement on connecting a wire next to the small red wire.
After studying the three diagrams I agree with Forest you should connect the wire coming from your circuit breaker. Leave the red/black wire covered with electrical tape.
if you have some handy, I actually prefer using glue-lined heat shrink tubing on the unused connector. I leave it a half inch long, shrink it with my HF heat gun and pinch it together while still warm for a tight seal.
Larry