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Our Atlas O and Ross switches we connected to our AIU.  For some reason the AIU itself just clicks.  I pressed read and it shows the TIU and the 2 AIU's.  Only 1 AIU is being used.  The remote show all kinds addresses.  I added a new switch address and just the AIU just clicks.

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I found on an old O Gauge Forum 11/05/15, Ed Walsh.  Help diagnosing AIU Switch problem.  In which I will try today.  I'am using MTH 24 Port Terminal Block.  Soldered Wire Terminals to the block.  I even tried direct to the Z4000 transformer.  A question on Stan's suggestion,  The Common wire is from the Block to the AIU IN and you briefly touch Port 1 and Port 2 by 1 wire from the switch, "Correct"?

Has anybody had problems with AIU's in series?  My 2 AIU's at home work just fine.  Plugging 2nd AIU to AIU1 should not just click?

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