What happens if you manually activate the 10, 100, or 1000 Point relays in the backbox?

I would unplug and re-plug the jones plug in the head.

Check for broken wires on both the male/female ends.

Focus on the Yellow, Red and Black wires.

I suspect the Red wire, because the score reset is powered by the Black wire, where as the point relays are controlled by the red.

When you add a game does the credit wheel decrease?

Check the coils that use the red wire in the head for any broken solder joints (Give the wire a gentle tug).

Good opportunity to use the 2 lightbulbs in series test rig to follow the wires through the path. I’d start with the 10 point relay. Does the relay itself get power? If not, work one of the two wires back through the circuit. There should be places in the backbox where you can pick up the red, black, and yellow wires to make sure they’re hot. That takes all the switches out of the picture. The jones plugs are the obvious suspects, both in the backbox and on the motor board. But I’ve run into plenty of cases where it’s a solder tab to the plug socket or a tie point where one of the common wires branches off.

You’ll find it. Good luck,

Dave

There is power getting to the reset coil and the score reels fed by the Black wire.
But it sounds like you are not getting power to the 10, 100, 1k, 10k point relay coils. These are fed by the Red wire.

Because the playfield appears to be working. I would focus on the backbox and its connections.

The other place to check would be the Tilt relay to ensure the red wires are connected - there maybe two and one maybe loose.

The chimes are energized by the yellow wire through a different contact on the 10, 100, 1000 point relays.