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i have the tracks all set there are 13 switches MTH 031 and 072 they all work except 1 072 when coupled to the track i t blows the transformer im using aux power when the switch is disconnected from the track it works fine i have replaced the switch and the 1 track i connect it to for the layout and it still blows the breaker when connected to all the track i replaced everything even the switch and it still does it any ideas will help

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Is this what your track switches look like? MTH Realtrax O72?

Do I understand correctly that you are powering the switch motor with auxiliary power rather than track power? If so have you removed the jumper between the track power terminal and the switch motor power terminal? It would have been between the first and second terminals at the left end of the terminal strip on the track switch.      

        IMG_1404

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