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As usual, I went downstairs to run my trains. I have Variable 2 in fixed mode so I can run My PS2 engines on my outer loop. All of the sudden, the breaker on my Z750 brick keeps blowing. I tried the brick on my other channels, no problem. I tried other bricks on the Variable 2 channel, and the breaker trips at about 9 volts. I opened my TIU, and no fuses appear to be blown. Is My Variable 2 channel bad?

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Try this simple test.

  • Disconnect the wires from both the input and the output of Variable #2
  • Turn on the transformer. If the breaker trips, the problem is in the wiring between the transformer and the TIU inputs. If not, proceed below
  • Leaving the outputs of Variable #2 disconnected, connect the transformer to the Variable #2 inputs. If the breaker trips, the problem is in the TIU. If not, the problem is in the tracks or the wiring connected to Variable #2 out.
Originally Posted by Barry Broskowitz:

Try this simple test.

  • Disconnect the wires from both the input and the output of Variable #2
  • Turn on the transformer. If the breaker trips, the problem is in the wiring between the transformer and the TIU inputs. If not, proceed below
  • Leaving the outputs of Variable #2 disconnected, connect the transformer to the Variable #2 inputs. If the breaker trips, the problem is in the TIU. If not, the problem is in the tracks or the wiring connected to Variable #2 out.

I have performed these steps, with all of my bricks, and The Breaker kicks at about 9 volts. The wiring to my track is fine, tested with a z controller and no breakers kicked. It is clearly this channel on my TIU. What should I do now?

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