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I'm assuming that this is the #334 Dispatch Board, MTH #30-9022. If so, according to the wiring diagram that accompanies r=the board:

  • Connect the upper right terminal to AIU Acc port "1" and also to 14 volt transformer HOT
  • Connect the lower right port to transformer Common
  • Connect the upper left terminal to AIU ACC port "IN".

 

 

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