Read your post earlier in the week & I had a look today at my "Card Whiz' which is similiar to 'Surfer' (2 player, 1976 Gottlieb). Check contacts on ' Add Player Unit Relay'. This is activated when the trough switch is closed. Contacts on this relay also turn the 'Motor'. When the 'Motor' turns, switch contacts close to operate 'target bank reset coil' as well as contacts which advance (pulse) the ' Add player Unit Coil'.