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I need to make a troubleshooting guide for this, but until then. Can you measure the resistance of the coils at the solder points to the board or the screw terminals? Does the light on the arduino turn on when you plug power into it? If so, does the light on the MOSFET module turn on shortly after? If so, try measuring the current at the 12v in on the MOSFET before and after the light turns on.