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Jamma harness - Right way up ?
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SirPeale:
To add a bit to this:

black wires generally signify ground, red +5V and yellow +12V.  You should be able to see on the board that the power traces mainly center around the ground and the +5V.  Ground can be difficult on a JAMMA board as there are grounds on both ends!  However, +5V is right next to the ground, and you should see that it forks everywhere.  If it doesn't, then you're looking at the player 2 controls, and power is at the other end.
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