Assuming the credit wheel is on zero - if you manually add a game to the
wheel, then will the credit button work?
For free play, typically a switch on the credit wheel is forced to be
closed all the time, or jumpered with a wire to simulate being closed
all the time. This allows the machine to always believe there are
credits.
So - if adding a credit manually allows it to work, then the free play
setup isn't working. As mentioned, if that's the case, a coin switch
will start a game.
Fred
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FredMaine