It could be a bad connection with the common yellow, but I'd check the
normally closed contacts in the Motor Relay, and in the 2nd Ball Relay.
If there's two 2nd Ball Relays (A & B), it's probably in 'A' that circuit flows
through, but it wouldn't hurt to check both the closed contacts (when in the
reset position) in both A & B 2nd Ball Relays.