Note: Williams Big Daddy has a design flaw.
1) Does game score normally if each switch is activated individually by hand?
1a) if yes, then
2) Does game score fail when ball goes through a top rollover switch and hits the pop bumper?
2a) if yes, then
3) you need to add a separation score relay to the game.

I believe it gives incorrect points total...
I think Williams has the flaw of opening up the circuit to the lock-in
contacts that control the pulses to the drum units.
single 1, or 10, or 100 points, works fine.
When the score motor turns, the lock-in points are disengaged and causes
the drums relays to free range.
Make sure you have a spring steel wave washer to the drum units that do not
have a pcb contact plate.

On Big Daddy, the pop bumpers are to close to the rollover lanes...
I helped a guy with his Big Daddy problem by adding another relay that separated the
rollover score contact from the pop bumper contacts...
I think the pop bumper relay added pulses to the next drum unit or something...
It had to do with the timing motor still turning and then the pop bumper relay
was adding free floating current pulses on top of everything...
I do not have the schematics to the game... it was a while ago.