Ok... i dont have the schematics for LITTLE CHIEF but i do have BIG BEN which is of the same year so operation will be the same.
TILT relay has a normally closed switch on it... this is directly linked to a 2 way switch on your ADV UNIT SWITCH which can be open or closed... if this is closed then it activates your bonus unit.. it has to go open to disable the bonus unit continually running.
Been a while since i worked on a WMS game, but when it tilts, lights go out, so id be checking all contacts on this relay and making sure the 2 way switch on ADV UNIT is operating correctly
