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Start button is on the switch matrix, don't be just shorting the wires together.
Wires should be orange and black (row) and green and brown (column) from the cpu board, and it quite likely terminates in the coin door interface board.
Try touching row 3 to column 1 at the cpu board connectors to see if that starts the game, use any diode to make the connection between the 2 pins
Try tracing the wires to the coin door interface board and give the connectors are reseat. Check for breaks in the wires or failure at the termination points in the connectors