[Arcades Brother] Well we touched up the solder on the battery mod but it didn't help the issue I haven't mentioned yet. There is no memory retention for credits or high score. I thought sure that was it but it wasn't. I get 5 volts all the way up through the board connectors. Sometimes when I remove and add the batteries back it will take and hold credits and a high score but that usually only lasts till I turn it off and back on. (when I say it won't take and hold credits it will not go past 1 credit. To play a multiplayer game I have to put a credit and push the start button then put a credit then push the start....)

Here are the boards. They are in great shape. All the contacts are clean on the connectors. The person who restored this did a great job. You should see the rest of the game.

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I thought about it being wired backwards. Can you tell from the pic I posted? I'm not sure how to tell which way it would go

Edit: I found the power markings for the batteries and they are wired right. It was hidden from my view by the wire.

Oh. There is not a free play mod