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The chuff sensor is on the rear axle of the engine. 3 wires go from the engine to the tender for the sound board. One of these wires has a bad connection usually in the 6 pin connector that plugs in to the tender. Looking from the rear of the engine/tender, the 3 wires on the right of the connector are the power, return , and chuff signal. wires on the left are 2 for track power and one for rear light on the coal tender.
 
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