It looks like the 3 white wires should be connected together and the yellow wire should connect to the lug that has the pink wire on it.

It depends on the coin chute settings if credits are added or the machine just resets.

The coin chute settings are just in front of the score motor.

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Does the replay unit step up when one of the high scores is reached on either player?

Can you post a pic of the credit unit with the wiring corrections that I suggested? The max credit switch needs to be cleaned and checked for a closed connection.

The 3 pin settings to adjust this looks like it’s in the backbox next to the high score settings. Experiment with these along with the other mechanical board settings to find the proper combination.

On the 3 pin plug in the backbox, keep the pin in the middle socket.
On the coin control relay find the make/break switch with R-B wire connected to the long blade, a grey-G wire connected to the normally closed blade, and a O-W wire connected to the normally open blade. Inspect the normally open part of the switch that the blade is not touching the center blade or it’s connections are shorted. If this is happening the coin relay will pull in no matter what position the pin is in the 3 pin plug when a coin switch closes. The other 2 female sockets on the 3 pin plug will allow the machine to just reset or reset along with adding credits when a coin switch is tripped.